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<?php |
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/** |
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* Created by PhpStorm. |
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* User: xuan |
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* Date: 9/22/15 |
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* Time: 12:06 AM. |
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*/ |
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namespace PHPHub\Repositories\Eloquent\Traits; |
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use Exception; |
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use Input; |
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use PHPHub\Transformers\IncludeManager\IncludeManager; |
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trait AutoWithTrait |
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{ |
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/** |
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* 用户请求引入字段. |
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* |
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* @var array |
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*/ |
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protected $param_columns = null; |
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/** |
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* 根节点的字段. |
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* |
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* @var array |
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*/ |
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protected $param_root_columns = []; |
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/** |
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* 自动 with include 的关联. |
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* |
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* @return $this |
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*/ |
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public function autoWith() |
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{ |
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$include_manager = app(IncludeManager::class); |
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$param_columns = $this->parseColumnsParam(); |
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$which_includes = $include_manager->figureOutWhichIncludes(); |
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foreach ($which_includes as $include_name) { |
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$include = $include_manager->getIncludable($include_name); |
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$include->setColumns(array_get($param_columns, $include_name, [])); |
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if (! $include->getForeignKey()) { |
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$this->with($include->getRelation()); |
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} else { |
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$this->withOnly($include->getRelation(), $include->figureOutWhichColumns(), $include->isWithTrashed()); |
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} |
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} |
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return $this; |
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} |
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/** |
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* 添加一个可用的引入项. |
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* |
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* @param $name |
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* @param $default_columns |
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* |
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* @return $this |
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* |
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* @throws Exception |
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*/ |
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public function addAvailableInclude($name, $default_columns) |
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{ |
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$method_name = camel_case('include_'.str_replace('.', '_', $name)); |
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if (! method_exists($this, $method_name)) { |
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throw new Exception("You should define $method_name in your repository"); |
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} |
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call_user_func([$this, $method_name], $default_columns); |
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return $this; |
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} |
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/** |
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* 设置数据要查询的字段,自动绑定 include 关联的外键. |
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* |
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* @param $columns |
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* |
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* @return $this |
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*/ |
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public function autoWithRootColumns($columns) |
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{ |
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$this->parseColumnsParam(); |
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$include_manager = app(IncludeManager::class); |
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$this->model = $this->model |
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->select(array_merge($this->param_root_columns, $columns, $include_manager->getForeignKeys())); |
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return $this; |
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} |
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/** |
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* 解析 columns 参数,用于指定 include 关联的字段 |
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* eg. ?include=user&columns=user(name,avatar,gender). |
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* |
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* @return array |
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*/ |
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private function parseColumnsParam() |
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{ |
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if (null !== $this->param_columns) { |
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$this->param_columns; |
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} |
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$result = []; |
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$items = explode(',', Input::get('columns')); |
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foreach ($items as $item) { |
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$arr = explode('(', $item); |
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if (count($arr) !== 2) { |
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continue; |
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} |
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list($include, $columns_str) = $arr; |
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$result[$include] = explode(':', trim($columns_str, ')')); |
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} |
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$this->param_root_columns = array_get($result, 'root', []); |
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return $this->param_columns = array_except($result, ['root']); |
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} |
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} |
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idable
provides a methodequalsId
that in turn relies on the methodgetId()
. If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()
as an abstract method to the trait will make sure it is available.