I'm still trying to wrap my head around whereHas() method. My case is this. I want to pull all users that belong to class
This is relations
Classes model
public function users() {
return $this->belongsToMany('App\User')->withTimestamps();
}
User model
public function classes() {
return $this->belongsToMany('App\Classes')->withTimestamps();
}
controller
$class_us = User::whereHas('classes', function ($query) {
$query->where('class',1);
})->get();
When I do dd($class_us) I get an empty collection.
How can I resolve this problem?
Thanks.
in whereHas clouse the builder instance is coming from the related model so,
$class_us = User::whereHas('classes', function ($query) {
// here the builder belongs to Class model not User model
$query->where('id',1); // id because classes table has column as id
})->get();
Related
To keep things simple, I'll give an example in code to what I'm trying to Achieve.
Let's assume that we have a model called User with the following code:
class User
{
public function posts()
{
return $this->hasOne(Post::class);
}
}
And the Post model look something like this.
class Post
{
public function comments()
{
return $this->hasMany(Comment::class);
}
}
And now what I want to be able to do is for example:
$user = Auth::user();
$comments = $user->post->comments; //here, I only want the "comment_id" and "comment_content" fields to be included, not all the Comment Model fields !
you can simply use hasManyThrough in user model to connect comments table.
read about hasManyThrough here: docs
and after having a relation between user and comments (hasManyThrough)
you can use load (Lazy eager loading) method
there is an piece of code you can use here
$user->load(["comments" => function($q){
$q->select("comment_id","comment_content");
}]);
read more about Lazy eager loading: docs
I have the following tables :
users
id|name|username
Areas
id|name
user_area
id|user_id|area_id
Buildings
id|name|area_id
In User models i want to call query that every users have his assigned areas and his assigned areas has many buildings, so i created a method in User model that query the user assigned buildings.
In App\User Model:
public function areas()
{
return $this->belongsToMany('App\Area','area_user');
}
public function UserBuildings(){
return $this>hasManyThrough('App\Building','App\Area','user_id','area_id');
}
In App\Area Model:
public function users(){
return $this->belongsToMany('App\User','area_user','area_id','user_id');
}
public function buildings(){
return $this->hasMany('App\Building');
}
In App\Building Model:
public function areas(){
$this->belongsTo('App\Area');
}
How can i structure a relationship method in User Model that get the user assigned buildings.
Thanks
You can't use hasManyThrough here, but you can use nested whereHas() to get all buildings assigned to authenticated user:
Building::whereHas('area', function ($q) {
$q->whereHas('users', function ($q) {
$q->where('id', auth()->id());
});
})->get();
Also, you should rename areas relationship to area in Building model, since each building belongs to only one area.
I'm using Laravel 5.4.22 (the newest one). In MySQL, I have two tables, tag_categories and tags, which form a many-to-many relationship. What I need is a query which returns all the tags for the selected categories. I know how to solve this when I have only one object, and I know how to solve this with querying and looping each of those objects, but there has to be a query or eloquent based solution for the whole thing?
I understand the code below doesn't work because I'm using ->belongsToMany on a collection rather than an object, but how to I bridge this gap the simplest way?
$resultingTags = TagCategory::whereIn('id', $chosenCategoriesIds)
->belongsToMany(Tag::Class)->get();
dd($resultingTags);
belongsToMany generally belongs in the model class, not a method called on the fly. When looking to eager load the relationship, you then call the with() method on the query builder.
https://laravel.com/docs/5.4/eloquent-relationships#many-to-many
ex:
class User extends Model
{
/**
* The roles that belong to the user.
*/
public function roles()
{
return $this->belongsToMany('App\Role');
}
}
// Query
$users = User::with('roles')->get();
$rolesOfFirstUser = $users->first()->roles;
If you're trying to get all the tags of the given categories, then you should be querying tags, not tag_categories.
Tag::whereHas('categories', function ($query) use ($chosenCategoriesIds) {
$query->whereIn('id', $chosenCategoriesIds);
})->get();
This is One-to-many relation
Define relation at TagCategory model at app/TagCategory.php
public function tags()
{
return $this->hasMany('App\Tag');
}
And handle at your Controller
$resultingTags = TagCategory::whereIn('id', $chosenCategoriesIds)->with(['tags'])->get();
If you want define Many-To-Many relation for this case
You need to have 3 tables tags, tag_categories, tag_tag_category
Define relation at TagCategory model at app/TagCategory.php
public function tags()
{
return $this->belongsToMany('App\Tag', 'tag_tag_category', 'tagcategory_id', 'tag_id');
}
And handle at your Controller
$resultingTags = TagCategory::whereIn('id', $chosenCategoriesIds)->with(['tags'])->get();
my tables:
every part contain many of card.
every card belong to many of part.
now,using laravel eloquent model how can fetch all card for a part without add more column to database
You need to define your relationships like below:
class Part extends Model
{
public function cards()
{
return $this->belongsToMany('App\Cards', 'user_cards');
}
}
Then you can fetch all the cards for a part like below:
$cards = Part::with('cards')->find($part_id);
Part::whereHas('cards', function($query) use ($cardId){
$query->where('id', $cardId);
})->get();
And your model relation should contain like this, for Part.php
public function cards(){
return $this->belongsToMany('App\Card');
}
And for Card.php
public function parts(){
return $this->belongsToMany('App\Part');
}
I have below query in core php:
SELECT DISTINCT device_tocken FROM push_details JOIN users ON users.id=push_details.user_id
I have to integrate it in laravel 4
Application already have User extends Eloquent class
I created Push_details class as below
class Push_details extends Eloquent {
public $table = 'push_details';
public function User() {
return $this->hasMany('\User','id');
}
}
Table : users
Primary key : id
Table: push_details
Primary key: id
Foreign key: user_id belongsTo('users.id');
But i m not able to get expected result.
One more thing i didn't write anything in User's model yet.
Only way to join table is.. to join it, as Eloquent relations don't work using joins but separate queries with WHERE IN clauses. So this will do:
DB::table('push_details')
->select('device_tocken')
->distinct()
->join('users','users.id','=','push_details.user_id')
->get();
Above will return array of stdObject's so or if you need Eloquent Collection with Eloquent models as a result replace DB::table('push_details')->select... with PushDetails::select...
Now, correct your relations, as they are wrong:
// PushDetails model (as previously stated, I suggest renaming it to StudlyCase)
public function user() {
return $this->belongsTo('\User','user_id'); // user_id is may be omitted here
}
// User model
public function pushDetails() {
return $this->hasMany('\PushDetails','user_id'); // user_id is may be omitted here as well
}
In your User model, you need to link back to the PushDetails model, like so
class User extends Eloquent {
public function push_details() {
return $this->belongsTo('PushDetails');
}
}
Use CamelCase for Class names, because laravel has several functions, in which CamelCase are changed to snake_case
Change
public function User() {
return $this->hasMany('\User','id');
}
to
public function users() {
return $this->hasMany('User');
}
See the docs 'Eloquent ORM' for more...