How to retrieve all records which had been attached to multiple users, please? For example I need each and every post attached to either user A, B or C. I've belongsToMany relationship set correctly, but don't know how to merge them all together. Thank you!
Posts below are attached to each user by belongsToMany relationship.
User A - Post 1 / Post 2
User B - Post 3 / Post 4 / Post 5
User C - Post 3 / Post 5 / Post 6
Now, for User D I need an eloquent of all these Posts (Post 1,2,3,4,5,6).
Can't you just query through users ID's? Like so:
$posts = Post::whereHas('users', function($q) use($usersIds) {
$q->whereIn('id', $usersIds);
})->get();
Since posts are attached to user by belongsToMany relationship, you can simply use the relationship from Post model to fetch the data. Suppose users is the name of relationship in Post model.
$result = Post::with('users')->whereIn('id',$userIds)->get();
Related
I have three tables. they are,
users
id name
1 personA
2 personB
3 personC
skills
id name
1 html
2 css
3 javascript
userskills
userid skills_id
2 3
2 1
1 2
1 3
I get the data through the request like [2,1] and the user id 2. On the user skills table in userid 2 there are skills_id3,1. Now i have to remove skills_id 3 and insert skills_id 2 on the userid 2.
How can i achieve it through laravel eloquent method.
As you have a pivot table you can use belongsToMany relationship. Adding the relationship in your User Model
public function skills()
{
return $this->belongsToMany(Skill::class, 'userskills','userid', 'skills_id');
//userskills is the pivot table
}
Now to update use the sync method.
$user = User::findOrFail(2); //your request id
$user->skills()->sync([1, 2]); //request array
This will remove the 3 from the pivot table and add 2 in the table.
Read more about this relationship in here
Your question is little ambiguous but lets assume that you are getting the user id 2 and the skills you want to remove from userskills is 2,1
For deleting
UserSkills::where(['userid' => 2 ])->whereIn('skills_id',[2,1])->delete();
For inserting
UserSkills::create(['skills_id' => 2, 'userid' => 2 ]);
An easier approach using relation would be
$user->skills()->sync([2, 1]);
Sync will remove those skills which are not present in the sync method.
Using Laravel + Voyager, I have a "Has Many" relationship:
Course hasMany Teachers.
In backend all is fine, but if I try to get the information in the frontend, I only get the value in table, not the relation, so the output goes something like:
0
id 1
teachers_id null
name "Math"
1
id 2
teachers_id null
name "English"
Current code in web routing:
Route::get('/course', function () {
$co= App\Course::all();
return $co;
});
How can I get the correct output?
teachers_id Xav, Titus
so like #Tpojka commented you can start by eager loading the relationship when you are initializing the course likeso $co = App\Course::with('teachers')->get(); after which you do not need to make another unnecessary call to your database for the teachers of that course. You can get a collection of all the teachers of that course by simply calling $teachers = $co->teachers; here $teachers is now a laravel collection you can simply loop through it on the client side and display the information about the teachers you want to display. I hope this helps.
Good luck and happy coding. :)
I'm using Laravel and eloquent obviously.
I have 4 models and tables.
1 => city
2 => location
3 => venue
4 => tag
now bear with me to describe relationship.
a city has many locations and a location belongs to a city.
a location belongs to a venue and a venue has one location.
a venue belongs to many tags and a tag belongs to many venue (Many to many relationship)
Here are the query I wanna executed.
given A city, how can I filter venues of that city based on tags.
example: for city Austin I wanna get venues that have tag "special".
and Also, how many queries are executed for perform this task.Is it efficient to perform this kind of task with this database model.
I tried to be as explicit as possible but if some parts seems vague for you, please don't hesitate to ask.
thanks
Eloquent query below filters result based on relationship:
$venues = Venue::whereHas('location', function($query) use ($city) {
$query->where('city_id',$city->id);
})->get();
Yo all,
I have a users relationship pivot db table as follows:
id | user_id | relation_id | relationship
1 4 2 tutor
1 4 3 parent
The table relates user with one-and-other for various reasons.
I am trying to get the relationship column within the $user. I have managed to pull the related users
details no problem - $user->relations.
However, I just need to get the relationship - eg. Tutor or parent.
I am getting no dice with $relative->pivot->relationship
Any ideas? Thanks for taking the time to help.
#foreach($user->relations as $index=>$relative)
{{ $relative->first_name . ' ' . $relative->last_name}}
{{ $relative->pivot->relationship }}
#endforeach
To access ->pivot->whatever you need to add withPivot('whatever') to the relation definition:
public function relations()
{
return $this->belongsToMany('Relation')->withPivot('relationship');
}
Note: I wouldn't use relations and Relation names here, since it's misleading AND it may collide with Eloquent\Model stuff.
Some help with many to many relationships in Laravel:
Using the example for roles and users - basically:
a table for all the roles
a table for the users
and table with user_id and role_id.
I want to add to the third table, eg Year. basically the pivot table will have user_id, role_id and year_id.
I want to be able to make a query to pull for example all users assigned a specific role in a specific year. Eg All users with role_id = 2, and year_id = 1.
Any help will be appreciated
Before answering, I would like to suggest you not to put year on database like this.
All your tables should have created_at and updated_at which should be enough for that.
To filter users like you want. You could do this:
// This queries all users that were assigned to 'admin' role within 2013.
User::join('role_users', 'role_users.user_id', '=', 'users.id')
->join('roles', 'roles.id', '=', 'role_users.role_id')
->where('roles.name', '=', 'admin')
->where(DB::raw('YEAR(role_users.created_at)', '=', '2013')
->get();
This example may not be the precise query you are looking for, but should be enough for you to come up with it.
The best way to achieve a three way relation with Eloquent is to create a model for the table representing this relation. Pivot tables is meant to be used for two way relations.
You could have then a table called roles_users_year which could have data related to this 3 way relation like a timestamp or whatever...
A very late answer to a very old question, but Laravel has supported additional intermediate (pivot) table columns of at least Laravel 5.1 judging from the documentation, which hasn't changed at least through Laravel 6.x.
You can describe these extra columns when defining your many-to-many relationship:
return $this->belongsToMany(Role::class)->withPivot('column1', 'column2');
or in your case, the below would also do the job:
return $this->belongsToMany(Role::class)->withTimestamps();
which you can then access via the pivot attribute on your model:
$user = User::find(1);
foreach ($user->roles as $role) {
echo $role->pivot->created_at;
}
Note that the pivot attribute is on the distant relationship model (a single Role) and not on the relationship itself.
To get all the Roles assigned to Users in any given year, you might create a special relationship:
// User.php
public function rolesInYear($year) {
return $this->belongsToMany(Role::class)
->wherePivot('created_at', '>=', Carbon::create($year))
->wherePivot('created_at', '<', Carbon::create($year + 1));
}