Eloquent filter on pivot table created_at

问题

I want to filter the contents of two tables which have an Eloquent belongsToMany() to each other based on the created_at column in the pivot table that joins them. Based on this SO question I came up with the following:

$data = ModelA::with(['ModelB' => function ($q) {
        $q->wherePivot('test', '=', 1);
    }])->get();

Here I'm using a simple test column to check if it's working, this should be 'created_at'.

What happens though is that I get all the instances of ModelA with the ModelB information if it fits the criteria in the wherePivot(). This makes sense because it's exactly what I'm telling it to do.

My question is how do I limit the results returned based on only the single column in the pivot table? Specifically, I want to get all instances of ModelA and ModelB that were linked after a specific date.

回答1:

OK, here it goes, since the other answer is still wrong.

First off, wherePivot won't work in whereHas closure. It's BelongsToManys method and works only on the relation object (so it works when eager loading).

$data = ModelA::with(['relation' => function ($q) use ($someDate) {

    $q->wherePivot('created_at', '>', $someDate);
    // or
    // $q->where('pivot_table.created_at', '>', $someDate);

    // or if the relation defines withPivot('created_at')
    // $q->where('pivot_created_at', '>', $someDate);

}])->whereHas('ModelB', function ($q) use ($someDate) {

    // wherePivot won't work here, so:
    $q->where('pivot_table.created_at', '>', $someDate);

})->get();

回答2:

You are using Eager Loading Constraints, which constrain only, like you said, the results of the related table.

What you want to use is whereHas:

$data = ModelA::whereHas('ModelB' => function ($q) {
    $q->wherePivot('test', '=', 1);
})->get();

Be aware that ModelB here refers to the name of the relationship.

来源：https://stackoverflow.com/questions/24531682/eloquent-filter-on-pivot-table-created-at

标签

laravel

laravel-4

many-to-many

eloquent