在laravel模型中处理关系

Question

I am learning relationships in Laravel php framework and I am trying to build this query

SELECT * FROM users u INNER JOIN link_to_stores lts ON u.id=lts.user_id INNER JOIN stores s ON lts.store_id=s.store_id WHERE lts.privilege = 'Owner'

I built this in Model

Link_to_store.php

public function store()
{
    return $this->belongsTo('App\Store');
}

public function user()
{
    return $this->belongsTo('App\User');
}

User.php

public function store_links()
{
    return $this->hasMany('App\Link_to_store');
}

Store.php

public function user_links()
{
    return $this->hasMany('App\Link_to_store');
}

I tried this query but this only joins user and link_to_store table

$personal_stores = Auth::user()->store_links->where('privilege','=','Owner');

Now I am confused how to join store table too. Can anyone help with this?

Schema is like this

Stores Table

store_id store_name

Users Table

id name

Link_to_stores Table

id store_id user_id privilege

Answer 1

I suppose store_links is actually a pivot table. In this case, you can use belongsToMany() , this will automatically take care of the pivot table.

To do this, in your User model you change the store function to this:

function stores() {
    return $this->belongsToMany('App\Store', 'store_links', 'user_id', 'store_id')->withPivot('privilege');
}

Because the primary key of stores is not id , you will have to define this in you Store model with the following line:

protected $primaryKey = 'store_id';

Now to get the stores for a user, you simply call

$stores = Auth::user->stores()->wherePivot('privilege', 'Owner')->get();

Answer 2

I am learning relationships in Laravel php framework and I am trying to build this query

SELECT * FROM users u INNER JOIN link_to_stores lts ON u.id=lts.user_id INNER JOIN stores s ON lts.store_id=s.store_id WHERE lts.privilege = 'Owner'

You are trying to do a join here. You can do a join like this:

$stores = User::join('link_to_stores as lts', 'users.id', '=', 'lts.user_id')->join('stores as s', 'lts.store_id', '=', 's.id')->where('lts.privilege', 'Owner')->get();

But like Jerodev pointed out, it seems like Many to Many relationship might make more sense in your case. The difference is that relationship will actually execute 2 queries (1 for original model, 1 for relationship). It will then attach the related models to the original model (which is extremely handy).