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<?php |
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namespace Backpack\CRUD\app\Library\CrudPanel\Traits; |
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use Illuminate\Support\Facades\DB; |
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/** |
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* Properties and methods for the Reorder operation. |
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*/ |
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trait Reorder |
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{ |
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/** |
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* Change the order and parents of the given elements, according to the NestedSortable AJAX call. |
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* |
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* @param array $request The entire request from the NestedSortable AJAX Call. |
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* @return int The number of items whose position in the tree has been changed. |
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*/ |
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public function updateTreeOrder($request) |
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{ |
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$primaryKey = $this->model->getKeyName(); |
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$columns = $this->getOperationSetting('reorderColumnNames'); |
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// we use the upsert method that should update the values of the matching ids. |
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// it has the drawback of creating new entries when the id is not found |
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// for that reason we get a list of all the ids and filter the ones |
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// sent in the request that are not in the database |
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$itemKeys = $this->model->query()->select($primaryKey)->get()->pluck($primaryKey); |
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// filter the items that are not in the database and map the request |
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$reorderItems = collect($request)->filter(function ($item) use ($itemKeys) { |
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return $item['item_id'] !== '' && $item['item_id'] !== null && $itemKeys->contains($item['item_id']); |
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})->map(function ($item) use ($primaryKey, $columns) { |
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$item[$primaryKey] = $item['item_id']; |
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$item[$columns['parent_id']] = empty($item['parent_id']) ? null : $item['parent_id']; |
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$item[$columns['depth']] = empty($item['depth']) ? null : (int) $item['depth']; |
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$item[$columns['lft']] = empty($item['left']) ? null : (int) $item['left']; |
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$item[$columns['rgt']] = empty($item['right']) ? null : (int) $item['right']; |
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// unset mapped items properties. |
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if ($columns['parent_id'] !== 'parent_id') { |
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unset($item['parent_id']); |
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} |
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if ($columns['depth'] !== 'depth') { |
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unset($item['depth']); |
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} |
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if ($columns['lft'] !== 'left') { |
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unset($item['left']); |
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} |
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if ($columns['rgt'] !== 'right') { |
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unset($item['right']); |
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} |
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// unset the item_id property |
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unset($item['item_id']); |
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return $item; |
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})->toArray(); |
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$sentIds = array_column($reorderItems, $primaryKey); |
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$itemKeys = $itemKeys->filter(function ($id) use ($sentIds) { |
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return in_array($id, $sentIds); |
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}); |
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// wrap the queries in a transaction to avoid partial updates |
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DB::connection($this->model->getConnectionName())->transaction(function () use ($reorderItems, $primaryKey, $itemKeys, $columns) { |
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// create a string of ?,?,?,? to use as bind placeholders for item keys |
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$reorderItemsBindString = implode(',', array_fill(0, count($reorderItems), '?')); |
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// each of this properties will be updated using a single query with a CASE statement |
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// this ensures that only 4 queries are run, no matter how many items are reordered |
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foreach (array_values($columns) as $column) { |
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$query = ''; |
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$bindings = []; |
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$query .= "UPDATE {$this->model->getTable()} SET {$column} = CASE "; |
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foreach ($reorderItems as $item) { |
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$query .= "WHEN {$primaryKey} = ? THEN ? "; |
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$bindings[] = $item[$primaryKey]; |
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$bindings[] = $item[$column]; |
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} |
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// add the bind placeholders for the item keys at the end the array of bindings |
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array_push($bindings, ...$itemKeys->toArray()); |
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// add the where clause to the query to help match the items |
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$query .= "ELSE {$column} END WHERE {$primaryKey} IN ({$reorderItemsBindString})"; |
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DB::connection($this->model->getConnectionName())->statement($query, $bindings); |
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} |
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}); |
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return count($reorderItems); |
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} |
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/** |
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* Enable the Reorder functionality in the CRUD Panel for users that have the been given access to 'reorder' using: |
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* $this->crud->allowAccess('reorder');. |
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* |
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* @param string $label Column name that will be shown on the labels. |
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* @param int $max_level Maximum hierarchy level to which the elements can be nested (1 = no nesting, just reordering). |
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*/ |
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public function enableReorder($label = 'name', $max_level = 1) |
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{ |
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$this->setOperationSetting('enabled', true); |
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$this->setOperationSetting('label', $label); |
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$this->setOperationSetting('max_level', $max_level); |
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} |
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/** |
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* Disable the Reorder functionality in the CRUD Panel for all users. |
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*/ |
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public function disableReorder() |
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{ |
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$this->setOperationSetting('enabled', false); |
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} |
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/** |
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* Check if the Reorder functionality is enabled or not. |
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* |
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* @return bool |
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*/ |
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public function isReorderEnabled() |
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{ |
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return $this->getOperationSetting('enabled'); |
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} |
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} |
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Laravel-Backpack /
CRUD
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