Laravel 团队昨天发布了 v7.4.0 版本，其中包含相当多的新特性，例如自定义的模型转换器接口、 When 高阶集合代理，以及从查询构建器中清除现有 order 的功能。高阶的 When 集合代理 Loris Leiva 贡献了使用高阶代理的能力，它的方法是 Collection：：When()// PR 中的相关代码$collection->when($condition,fun...
你可在 Eloquent 模型类内中,把 Eloquent 关联定义成函数(functions)。因为,关联就像 Eloquent 模型一样,也可以作为强大的 查询语句构造器,定义关联为函数,因为其提供了强而有力的链式调用及查找功能。例如,我们可以在 posts 关联的链式调用中附加一个约束条件:...
Eloquent: Relationships - Laravel中文网 , laravel中文文档。Laravel 是一个具有表现力、优雅语法的 Web 应用程序框架. Laravel 是构建现代全栈 Web 应用程序的最佳选择.
The above example will make a single database query, retrieve all the records from the table, and hydrate Eloquent models one by one. This approach will make only one database query to retrieve all the posts. But usesphp generatorto optimize the memory usage. when can you use this? Though...
下面是一个示例,演示了如何在Laravel Eloquent中使用If语句: 代码语言:txt 复制 $users = User::query() ->when($condition, function ($query) { return $query->where('status', '=', 'active'); }, function ($query) { return $query->where('status', '=', 'inactive'); }) ->get(); ...
This model may be used with the default Eloquent authentication driver. If your application is not using Eloquent, you may use the database authentication provider which uses the Laravel query builder.When building the database schema for the App\Models\User model, make sure the password column ...
Eloquent will also assume that each table has a primary key column named id. You may define a primaryKey property to override this convention. Likewise, you may define a connection property to override the name of the database connection that should be used when utilizing the model....
Eloquent 通过检查关联方法的名称,从而在关联方法名称后面加上_,然后再加上父模型 (Post)的主键名称,以此来作为默认的外键名。因此,在上面这个例子中,Eloquent 将会默认Post模型在comments表中的外键是post_id。 由于所有的关系都可以看成是查询构造器,所以您也可以通过链式调用的方式,在comments方法中继续添加条件约束...
本文转自: https://hdtuto.com/article/laravel-where-null-and-where-not-null-eloquent-query-example- if you are a starter or learner laravel then you have in mind how to check where null or where not null condition using laravel eloquent model when you are writing eloquent query. if you ...
() * @method void ddSoarJsonScores() * @method string toSoarHtmlScores() * @method void echoSoarHtmlScores() * @method void exitSoarHtmlScores() * * @mixin \Illuminate\Database\Query\Builder * * @see \Guanguans\LaravelSoar\Macros\QueryBuilderMacro * @see \Illuminate\Database\Eloquent\...