silverstripe /
silverstripe-framework
| Total Complexity | 57 |
| Total Lines | 472 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like ManyManyList often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ManyManyList, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 16 | class ManyManyList extends RelationList |
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| 17 | { |
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| 18 | |||
| 19 | /** |
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| 20 | * @var string $joinTable |
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| 21 | */ |
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| 22 | protected $joinTable; |
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| 23 | |||
| 24 | /** |
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| 25 | * @var string $localKey |
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| 26 | */ |
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| 27 | protected $localKey; |
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| 28 | |||
| 29 | /** |
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| 30 | * @var string $foreignKey |
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| 31 | */ |
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| 32 | protected $foreignKey; |
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| 33 | |||
| 34 | /** |
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| 35 | * @var array $extraFields |
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| 36 | */ |
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| 37 | protected $extraFields; |
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| 38 | |||
| 39 | /** |
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| 40 | * @var array $_compositeExtraFields |
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| 41 | */ |
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| 42 | protected $_compositeExtraFields = array(); |
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| 43 | |||
| 44 | /** |
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| 45 | * Create a new ManyManyList object. |
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| 46 | * |
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| 47 | * A ManyManyList object represents a list of {@link DataObject} records |
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| 48 | * that correspond to a many-many relationship. |
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| 49 | * |
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| 50 | * Generation of the appropriate record set is left up to the caller, using |
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| 51 | * the normal {@link DataList} methods. Addition arguments are used to |
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| 52 | * support {@@link add()} and {@link remove()} methods. |
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| 53 | * |
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| 54 | * @param string $dataClass The class of the DataObjects that this will list. |
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| 55 | * @param string $joinTable The name of the table whose entries define the content of this many_many relation. |
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| 56 | * @param string $localKey The key in the join table that maps to the dataClass' PK. |
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| 57 | * @param string $foreignKey The key in the join table that maps to joined class' PK. |
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| 58 | * @param array $extraFields A map of field => fieldtype of extra fields on the join table. |
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| 59 | * |
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| 60 | * @example new ManyManyList('Group','Group_Members', 'GroupID', 'MemberID'); |
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| 61 | */ |
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| 62 | public function __construct($dataClass, $joinTable, $localKey, $foreignKey, $extraFields = array()) |
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| 63 | { |
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| 64 | parent::__construct($dataClass); |
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| 65 | |||
| 66 | $this->joinTable = $joinTable; |
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| 67 | $this->localKey = $localKey; |
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| 68 | $this->foreignKey = $foreignKey; |
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| 69 | $this->extraFields = $extraFields; |
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| 70 | |||
| 71 | $this->linkJoinTable(); |
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| 72 | } |
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| 73 | |||
| 74 | /** |
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| 75 | * Setup the join between this dataobject and the necessary mapping table |
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| 76 | */ |
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| 77 | protected function linkJoinTable() |
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| 78 | { |
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| 79 | // Join to the many-many join table |
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| 80 | $dataClassIDColumn = DataObject::getSchema()->sqlColumnForField($this->dataClass(), 'ID'); |
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| 81 | $this->dataQuery->innerJoin( |
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| 82 | $this->joinTable, |
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| 83 | "\"{$this->joinTable}\".\"{$this->localKey}\" = {$dataClassIDColumn}" |
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| 84 | ); |
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| 85 | |||
| 86 | // Add the extra fields to the query |
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| 87 | if ($this->extraFields) { |
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| 88 | $this->appendExtraFieldsToQuery(); |
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| 89 | } |
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| 90 | } |
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| 91 | |||
| 92 | /** |
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| 93 | * Adds the many_many_extraFields to the select of the underlying |
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| 94 | * {@link DataQuery}. |
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| 95 | * |
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| 96 | * @return void |
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| 97 | */ |
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| 98 | protected function appendExtraFieldsToQuery() |
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| 99 | { |
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| 100 | $finalized = array(); |
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| 101 | |||
| 102 | foreach ($this->extraFields as $field => $spec) { |
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| 103 | $obj = Injector::inst()->create($spec); |
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| 104 | |||
| 105 | if ($obj instanceof DBComposite) { |
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| 106 | $this->_compositeExtraFields[$field] = array(); |
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| 107 | |||
| 108 | // append the composite field names to the select |
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| 109 | foreach ($obj->compositeDatabaseFields() as $subField => $subSpec) { |
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| 110 | $col = $field . $subField; |
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| 111 | $finalized[] = $col; |
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| 112 | |||
| 113 | // cache |
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| 114 | $this->_compositeExtraFields[$field][] = $subField; |
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| 115 | } |
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| 116 | } else { |
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| 117 | $finalized[] = $field; |
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| 118 | } |
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| 119 | } |
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| 120 | |||
| 121 | $this->dataQuery->addSelectFromTable($this->joinTable, $finalized); |
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| 122 | } |
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| 123 | |||
| 124 | /** |
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| 125 | * Create a DataObject from the given SQL row. |
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| 126 | * |
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| 127 | * @param array $row |
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| 128 | * @return DataObject |
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| 129 | */ |
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| 130 | public function createDataObject($row) |
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| 131 | { |
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| 132 | // remove any composed fields |
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| 133 | $add = array(); |
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| 134 | |||
| 135 | if ($this->_compositeExtraFields) { |
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| 136 | foreach ($this->_compositeExtraFields as $fieldName => $composed) { |
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| 137 | // convert joined extra fields into their composite field types. |
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| 138 | $value = array(); |
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| 139 | |||
| 140 | foreach ($composed as $subField) { |
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| 141 | if (isset($row[$fieldName . $subField])) { |
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| 142 | $value[$subField] = $row[$fieldName . $subField]; |
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| 143 | |||
| 144 | // don't duplicate data in the record |
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| 145 | unset($row[$fieldName . $subField]); |
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| 146 | } |
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| 147 | } |
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| 148 | |||
| 149 | $obj = Injector::inst()->create($this->extraFields[$fieldName], $fieldName); |
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| 150 | $obj->setValue($value, null, false); |
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| 151 | $add[$fieldName] = $obj; |
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| 152 | } |
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| 153 | } |
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| 154 | |||
| 155 | $dataObject = parent::createDataObject($row); |
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| 156 | |||
| 157 | foreach ($add as $fieldName => $obj) { |
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| 158 | $dataObject->$fieldName = $obj; |
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| 159 | } |
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| 160 | |||
| 161 | return $dataObject; |
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| 162 | } |
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| 163 | |||
| 164 | /** |
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| 165 | * Return a filter expression for when getting the contents of the |
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| 166 | * relationship for some foreign ID |
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| 167 | * |
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| 168 | * @param int|null $id |
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| 169 | * |
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| 170 | * @return array |
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| 171 | */ |
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| 172 | protected function foreignIDFilter($id = null) |
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| 173 | { |
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| 174 | if ($id === null) { |
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| 175 | $id = $this->getForeignID(); |
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| 176 | } |
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| 177 | |||
| 178 | // Apply relation filter |
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| 179 | $key = "\"{$this->joinTable}\".\"{$this->foreignKey}\""; |
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| 180 | if (is_array($id)) { |
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| 181 | return array("$key IN (" . DB::placeholders($id) . ")" => $id); |
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| 182 | } elseif ($id !== null) { |
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| 183 | return array($key => $id); |
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| 184 | } |
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| 185 | return null; |
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| 186 | } |
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| 187 | |||
| 188 | /** |
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| 189 | * Return a filter expression for the join table when writing to the join table |
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| 190 | * |
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| 191 | * When writing (add, remove, removeByID), we need to filter the join table to just the relevant |
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| 192 | * entries. However some subclasses of ManyManyList (Member_GroupSet) modify foreignIDFilter to |
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| 193 | * include additional calculated entries, so we need different filters when reading and when writing |
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| 194 | * |
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| 195 | * @param array|int|null $id (optional) An ID or an array of IDs - if not provided, will use the current ids |
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| 196 | * as per getForeignID |
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| 197 | * @return array Condition In array(SQL => parameters format) |
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| 198 | */ |
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| 199 | protected function foreignIDWriteFilter($id = null) |
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| 202 | } |
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| 203 | |||
| 204 | /** |
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| 205 | * Add an item to this many_many relationship |
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| 206 | * Does so by adding an entry to the joinTable. |
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| 207 | * |
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| 208 | * Can also be used to update an already existing joinTable entry: |
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| 209 | * |
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| 210 | * $manyManyList->add($recordID,["ExtraField" => "value"]); |
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| 211 | * |
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| 212 | * @throws InvalidArgumentException |
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| 213 | * @throws Exception |
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| 214 | * |
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| 215 | * @param DataObject|int $item |
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| 216 | * @param array $extraFields A map of additional columns to insert into the joinTable. |
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| 217 | * Column names should be ANSI quoted. |
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| 218 | * @throws Exception |
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| 219 | */ |
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| 220 | public function add($item, $extraFields = array()) |
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| 221 | { |
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| 222 | // Ensure nulls or empty strings are correctly treated as empty arrays |
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| 223 | if (empty($extraFields)) { |
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| 224 | $extraFields = array(); |
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| 225 | } |
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| 226 | |||
| 227 | // Determine ID of new record |
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| 228 | $itemID = null; |
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| 229 | if (is_numeric($item)) { |
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| 230 | $itemID = $item; |
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| 231 | } elseif ($item instanceof $this->dataClass) { |
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| 232 | $itemID = $item->ID; |
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| 233 | } else { |
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| 234 | throw new InvalidArgumentException( |
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| 235 | "ManyManyList::add() expecting a $this->dataClass object, or ID value" |
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| 236 | ); |
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| 237 | } |
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| 238 | if (empty($itemID)) { |
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| 239 | throw new InvalidArgumentException("ManyManyList::add() doesn't accept unsaved records"); |
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| 240 | } |
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| 241 | |||
| 242 | // Validate foreignID |
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| 243 | $foreignIDs = $this->getForeignID(); |
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| 244 | if (empty($foreignIDs)) { |
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| 245 | throw new BadMethodCallException("ManyManyList::add() can't be called until a foreign ID is set"); |
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| 246 | } |
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| 247 | |||
| 248 | // Apply this item to each given foreign ID record |
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| 249 | if (!is_array($foreignIDs)) { |
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| 250 | $foreignIDs = array($foreignIDs); |
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| 251 | } |
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| 252 | foreach ($foreignIDs as $foreignID) { |
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| 253 | // Check for existing records for this item |
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| 254 | if ($foreignFilter = $this->foreignIDWriteFilter($foreignID)) { |
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| 255 | // With the current query, simply add the foreign and local conditions |
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| 256 | // The query can be a bit odd, especially if custom relation classes |
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| 257 | // don't join expected tables (@see Member_GroupSet for example). |
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| 258 | $query = new SQLSelect("*", "\"{$this->joinTable}\""); |
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| 259 | $query->addWhere($foreignFilter); |
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| 260 | $query->addWhere(array( |
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| 261 | "\"{$this->joinTable}\".\"{$this->localKey}\"" => $itemID |
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| 262 | )); |
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| 263 | $hasExisting = ($query->count() > 0); |
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| 264 | } else { |
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| 265 | $hasExisting = false; |
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| 266 | } |
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| 267 | |||
| 268 | // Blank manipulation |
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| 269 | $manipulation = array( |
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| 270 | $this->joinTable => array( |
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| 271 | 'command' => $hasExisting ? 'update' : 'insert', |
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| 272 | 'fields' => array() |
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| 273 | ) |
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| 274 | ); |
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| 275 | if ($hasExisting) { |
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| 276 | $manipulation[$this->joinTable]['where'] = array( |
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| 277 | "\"{$this->joinTable}\".\"{$this->foreignKey}\"" => $foreignID, |
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| 278 | "\"{$this->joinTable}\".\"{$this->localKey}\"" => $itemID |
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| 279 | ); |
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| 280 | } |
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| 281 | |||
| 282 | /** @var DBField[] $fieldObjects */ |
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| 283 | $fieldObjects = []; |
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| 284 | if ($extraFields && $this->extraFields) { |
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| 285 | // Write extra field to manipluation in the same way |
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| 286 | // that DataObject::prepareManipulationTable writes fields |
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| 287 | foreach ($this->extraFields as $fieldName => $fieldSpec) { |
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| 288 | // Skip fields without an assignment |
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| 289 | if (array_key_exists($fieldName, $extraFields)) { |
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| 290 | $fieldObject = Injector::inst()->create($fieldSpec, $fieldName); |
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| 291 | $fieldObject->setValue($extraFields[$fieldName]); |
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| 292 | $fieldObject->writeToManipulation($manipulation[$this->joinTable]); |
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| 293 | $fieldObjects[$fieldName] = $fieldObject; |
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| 294 | } |
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| 295 | } |
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| 296 | } |
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| 297 | |||
| 298 | $manipulation[$this->joinTable]['fields'][$this->localKey] = $itemID; |
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| 299 | $manipulation[$this->joinTable]['fields'][$this->foreignKey] = $foreignID; |
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| 300 | |||
| 301 | // Make sure none of our field assignments are arrays |
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| 302 | foreach ($manipulation as $tableManipulation) { |
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| 303 | if (!isset($tableManipulation['fields'])) { |
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| 304 | continue; |
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| 305 | } |
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| 306 | foreach ($tableManipulation['fields'] as $fieldName => $fieldValue) { |
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| 307 | if (is_array($fieldValue)) { |
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| 308 | // If the field allows non-scalar values we'll let it do dynamic assignments |
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| 309 | if (isset($fieldObjects[$fieldName]) && $fieldObjects[$fieldName]->scalarValueOnly()) { |
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| 310 | throw new InvalidArgumentException( |
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| 311 | 'ManyManyList::add: parameterised field assignments are disallowed' |
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| 312 | ); |
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| 313 | } |
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| 314 | } |
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| 315 | } |
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| 316 | } |
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| 317 | |||
| 318 | DB::manipulate($manipulation); |
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| 319 | } |
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| 320 | } |
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| 321 | |||
| 322 | /** |
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| 323 | * Remove the given item from this list. |
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| 324 | * |
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| 325 | * Note that for a ManyManyList, the item is never actually deleted, only |
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| 326 | * the join table is affected. |
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| 327 | * |
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| 328 | * @param DataObject $item |
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| 329 | */ |
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| 330 | public function remove($item) |
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| 331 | { |
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| 332 | if (!($item instanceof $this->dataClass)) { |
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| 333 | throw new InvalidArgumentException("ManyManyList::remove() expecting a $this->dataClass object"); |
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| 334 | } |
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| 335 | |||
| 336 | return $this->removeByID($item->ID); |
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| 337 | } |
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| 338 | |||
| 339 | /** |
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| 340 | * Remove the given item from this list. |
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| 341 | * |
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| 342 | * Note that for a ManyManyList, the item is never actually deleted, only |
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| 343 | * the join table is affected |
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| 344 | * |
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| 345 | * @param int $itemID The item ID |
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| 346 | */ |
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| 347 | public function removeByID($itemID) |
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| 348 | { |
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| 349 | if (!is_numeric($itemID)) { |
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| 350 | throw new InvalidArgumentException("ManyManyList::removeById() expecting an ID"); |
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| 351 | } |
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| 352 | |||
| 353 | $query = new SQLDelete("\"{$this->joinTable}\""); |
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| 354 | |||
| 355 | if ($filter = $this->foreignIDWriteFilter($this->getForeignID())) { |
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| 356 | $query->setWhere($filter); |
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| 357 | } else { |
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| 358 | user_error("Can't call ManyManyList::remove() until a foreign ID is set"); |
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| 359 | } |
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| 360 | |||
| 361 | $query->addWhere(array( |
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| 362 | "\"{$this->joinTable}\".\"{$this->localKey}\"" => $itemID |
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| 363 | )); |
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| 364 | $query->execute(); |
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| 365 | } |
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| 366 | |||
| 367 | /** |
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| 368 | * Remove all items from this many-many join. To remove a subset of items, |
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| 369 | * filter it first. |
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| 370 | * |
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| 371 | * @return void |
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| 372 | */ |
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| 373 | public function removeAll() |
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| 374 | { |
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| 375 | |||
| 376 | // Remove the join to the join table to avoid MySQL row locking issues. |
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| 377 | $query = $this->dataQuery(); |
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| 378 | $foreignFilter = $query->getQueryParam('Foreign.Filter'); |
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| 379 | $query->removeFilterOn($foreignFilter); |
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| 380 | |||
| 381 | // Select ID column |
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| 382 | $selectQuery = $query->query(); |
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| 383 | $dataClassIDColumn = DataObject::getSchema()->sqlColumnForField($this->dataClass(), 'ID'); |
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| 384 | $selectQuery->setSelect($dataClassIDColumn); |
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| 385 | |||
| 386 | $from = $selectQuery->getFrom(); |
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| 387 | unset($from[$this->joinTable]); |
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| 388 | $selectQuery->setFrom($from); |
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| 389 | $selectQuery->setOrderBy(); // ORDER BY in subselects breaks MS SQL Server and is not necessary here |
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| 390 | $selectQuery->setDistinct(false); |
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| 391 | |||
| 392 | // Use a sub-query as SQLite does not support setting delete targets in |
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| 393 | // joined queries. |
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| 394 | $delete = new SQLDelete(); |
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| 395 | $delete->setFrom("\"{$this->joinTable}\""); |
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| 396 | $delete->addWhere($this->foreignIDFilter()); |
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| 397 | $subSelect = $selectQuery->sql($parameters); |
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| 398 | $delete->addWhere(array( |
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| 399 | "\"{$this->joinTable}\".\"{$this->localKey}\" IN ($subSelect)" => $parameters |
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| 400 | )); |
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| 401 | $delete->execute(); |
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| 402 | } |
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| 403 | |||
| 404 | /** |
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| 405 | * Find the extra field data for a single row of the relationship join |
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| 406 | * table, given the known child ID. |
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| 407 | * |
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| 408 | * @param string $componentName The name of the component |
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| 409 | * @param int $itemID The ID of the child for the relationship |
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| 410 | * |
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| 411 | * @return array Map of fieldName => fieldValue |
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| 412 | */ |
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| 413 | public function getExtraData($componentName, $itemID) |
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| 414 | { |
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| 415 | $result = array(); |
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| 416 | |||
| 417 | // Skip if no extrafields or unsaved record |
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| 418 | if (empty($this->extraFields) || empty($itemID)) { |
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| 419 | return $result; |
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| 420 | } |
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| 421 | |||
| 422 | if (!is_numeric($itemID)) { |
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| 423 | throw new InvalidArgumentException('ManyManyList::getExtraData() passed a non-numeric child ID'); |
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| 424 | } |
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| 425 | |||
| 426 | $cleanExtraFields = array(); |
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| 427 | foreach ($this->extraFields as $fieldName => $dbFieldSpec) { |
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| 428 | $cleanExtraFields[] = "\"{$fieldName}\""; |
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| 429 | } |
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| 430 | $query = new SQLSelect($cleanExtraFields, "\"{$this->joinTable}\""); |
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| 431 | $filter = $this->foreignIDWriteFilter($this->getForeignID()); |
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| 432 | if ($filter) { |
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| 433 | $query->setWhere($filter); |
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| 434 | } else { |
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| 435 | throw new BadMethodCallException("Can't call ManyManyList::getExtraData() until a foreign ID is set"); |
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| 436 | } |
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| 437 | $query->addWhere(array( |
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| 438 | "\"{$this->joinTable}\".\"{$this->localKey}\"" => $itemID |
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| 439 | )); |
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| 440 | $queryResult = $query->execute()->current(); |
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| 441 | if ($queryResult) { |
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| 442 | foreach ($queryResult as $fieldName => $value) { |
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| 443 | $result[$fieldName] = $value; |
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| 444 | } |
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| 445 | } |
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| 446 | |||
| 447 | return $result; |
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| 448 | } |
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| 449 | |||
| 450 | /** |
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| 451 | * Gets the join table used for the relationship. |
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| 452 | * |
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| 453 | * @return string the name of the table |
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| 454 | */ |
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| 455 | public function getJoinTable() |
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| 456 | { |
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| 457 | return $this->joinTable; |
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| 458 | } |
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| 459 | |||
| 460 | /** |
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| 461 | * Gets the key used to store the ID of the local/parent object. |
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| 462 | * |
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| 463 | * @return string the field name |
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| 464 | */ |
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| 465 | public function getLocalKey() |
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| 468 | } |
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| 469 | |||
| 470 | /** |
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| 471 | * Gets the key used to store the ID of the foreign/child object. |
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| 472 | * |
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| 473 | * @return string the field name |
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| 474 | */ |
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| 475 | public function getForeignKey() |
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| 478 | } |
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| 479 | |||
| 480 | /** |
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| 481 | * Gets the extra fields included in the relationship. |
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| 482 | * |
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| 483 | * @return array a map of field names to types |
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| 484 | */ |
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| 485 | public function getExtraFields() |
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| 488 | } |
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| 489 | } |
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| 490 |
Loading history...
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.