I have 3 tables
type
type_id
person
person_id
category
category_id
table_name
table_id
person_id
In category I have connections of different tables/models with Type model, So if I have want to get type_id connected with person with person_id = 23 the query should look like this:
SELECT * FROM category WHERE table_name='person' AND table_id = 23
In my Person model I defined relationship with Type this way:
public function groups()
{
return $this->belongsToMany('Type', 'category',
'table_id', 'type_id')->wherePivot( 'table_name', '=', 'person' );
}
When I want to get those types and I use:
$person->groups()->get()
The query looks like this:
select `type`.*, `category`.`table_id` as `pivot_table_id`, `category`.`type_id` as `pivot_type_id` from `type` inner join `category` on `type`.`type_id` = `category`.`type_id` where `category`.`table_id` = '23' and `category`.`table_name` = 'person';
so it seems to be correct.
But I would like to use sync()
for synchronizing types with persons and here's the problem.
When I use:
$person->groups()->sync('1' => ['table_name' => 'person']);
I see the query that gets all records from category to use for sync
looks like this:
select `type_id` from `category` where `table_id` = '23';
so it doesn't use
`category`.`table_name` = 'person'
condition so synchronization won't work as expected.
Is there any simple way to solve it or should I synchronize it manually?
You should use Eloquents polymorphic relations ( http://laravel.com/docs/4.2/eloquent#relationships )
class Category extends Eloquent {
public function categorizable()
{
return $this->morphTo();
}
}
class Person extends Eloquent {
public function categories()
{
return $this->morphMany('Category', 'categorizable');
}
}
Now we can retrieve catgories from person:
$person = Person::find(1);
foreach ($person->categories as $category)
{
//
}
and access person or other owner from category:
$category = Category::find(1);
$categorizable_model = $category->categorizable; //e.g. Person
I can confirm that it was a bug in Laravel 5 commit I used. I've upgraded for Laravel 5 final version and now query is generated as it should.
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