What i want to achieve?
Show user which pacts he is following.
What I am trying
I have designed two tables which are 'pacts' & 'pacts_follwers'
Table 'pacts' has the details of all the pacts
Table 'pacts_follwers' has details of users following a particular pact.
These links will give you the images of both the tables
For Schema Refer Images
So how to get pacts that user is following.
What I have tried?
Sql Query
SELECT pacts.*, (SELECT pactsid FROM pacts_follwers WHERE pacts.id = pacts_follwers.pactsid
and pacts_follwers.userid = 2 ) as pactID FROM `pacts`
Sql query Result
This query will give pactId some value, where the value is null means the user is not following that pact. If this is the solution then i would need Eloquent for this which i am unable to make.
1st table pacts
id
title
about
created_at
updated_at
pactsImage
2nd table pacts_follwers
id
pactsid
userid
created_at
updated_at
Controller Code
$pacts = DB::select("SELECT pacts.*, (SELECT pactsid FROM pacts_follwers WHERE pacts.id =
pacts_follwers.pactsid and pacts_follwers.userid = ".Auth::id()." ) as pactID FROM `pacts`");
You need to setup hasManyThrough relationship for User and Pact.
class User extends Model {
public function pacts() {
return $this->hasManyThrough(
Pact::class,
PactFollower::class
'userid',
'pactsid'
);
}
}
I don't fully understand if you want to achieve "get user's all pacts" or "if pact is followed by user". Either way, you need to setup related relationships.
Or really simple (and not efficient way)
class Pact extends Model {
public function followers() {
return $this->hasMany(PactFollower::class, 'pactsid')
}
}
Now you can use something like
$userIdsForPact = Pact::followers()->pluck('userid');
if ($userIdsForPact->has($user->id)) {
// your operation
}
Edit: For "if pact is followed by user", you need to setup belongsToThrough relationship. It doesn't come out of the box with Laravel but staudenmeir/belongs-to-through package should serve you well.
After setting the relationship properly, you can use something like this.
Pact::with('user')->get();
Or add some methods in your Pact model:
public function followedByUser($user) {
return $this->users->has($user);
}
I have two tables, User and Post. One User can have many posts and one post belongs to only one user.
In my User model I have a hasMany relation...
public function post(){
return $this->hasmany('post');
}
And in my post model I have a belongsTo relation...
public function user(){
return $this->belongsTo('user');
}
Now I want to join these two tables using Eloquent with() but want specific columns from the second table. I know I can use the Query Builder but I don't want to.
When in the Post model I write...
public function getAllPosts() {
return Post::with('user')->get();
}
It runs the following queries...
select * from `posts`
select * from `users` where `users`.`id` in (<1>, <2>)
But what I want is...
select * from `posts`
select id,username from `users` where `users`.`id` in (<1>, <2>)
When I use...
Post::with('user')->get(array('columns'....));
It only returns the column from the first table. I want specific columns using with() from the second table. How can I do that?
Well I found the solution. It can be done one by passing a closure function in with() as second index of array like
Post::query()
->with(['user' => function ($query) {
$query->select('id', 'username');
}])
->get()
It will only select id and username from other table. I hope this will help others.
Remember that the primary key (id in this case) needs to be the first param in the
$query->select() to actually retrieve the necessary results.*
You can do it like this since Laravel 5.5:
Post::with('user:id,username')->get();
Care for the id field and foreign keys as stated in the docs:
When using this feature, you should always include the id column and
any relevant foreign key columns in the list of columns you wish to
retrieve.
For example, if the user belongs to a team and has a team_id as a foreign key column, then $post->user->team is empty if you don't specifiy team_id
Post::with('user:id,username,team_id')->get();
Also, if the user belongs to the post (i.e. there is a column post_id in the users table), then you need to specify it like this:
Post::with('user:id,username,post_id')->get();
Otherwise $post->user will be empty.
For loading models with specific column, though not eager loading, you could:
In your Post model
public function user()
{
return $this->belongsTo('User')->select(['id', 'username']);
}
Original credit goes to Laravel Eager Loading - Load only specific columns
When going the other way (hasMany):
User::with(['post'=>function($query){
$query->select('id','user_id');
}])->get();
Don't forget to include the foreign key (assuming it is user_id in this example) to resolve the relationship, otherwise you'll get zero results for your relation.
In Laravel 5.7 you can call specific field like this
$users = App\Book::with('author:id,name')->get();
It is important to add foreign_key field in the selection.
If you want to get specific columns using with() in laravel eloquent then you can use code as below which is originally answered by #Adam in his answer here in response of this same question, the answer's main code is as below :
Post::with('user:id,username')->get();
So i have used it in my code but it was giving me error of 1052: Column 'id' in field list is ambiguous, so if you guys are also facing same problem
Then for solving it you have to specify table name before the id column in with() method as below code:
Post::with('user:user.id,username')->get();
I came across this issue but with a second layer of related objects. #Awais Qarni's answer holds up with the inclusion of the appropriate foreign key in the nested select statement. Just as an id is required in the first nested select statement to reference the related model, the foreign key is required to reference the second degree of related models; in this example the Company model.
Post::with(['user' => function ($query) {
$query->select('id','company_id', 'username');
}, 'user.company' => function ($query) {
$query->select('id', 'name');
}])->get();
Additionally, if you want to select specific columns from the Post model you would need to include the user_id column in the select statement in order to reference it.
Post::with(['user' => function ($query) {
$query->select('id', 'username');
}])
->select('title', 'content', 'user_id')
->get();
In your Post model:
public function userWithName()
{
return $this->belongsTo('User')->select(array('id', 'first_name', 'last_name'));
}
Now you can use $post->userWithName
There is another alternative you can eager load specific columns
public function show(Post $post)
{
$posts = $post->has('user')->with('user:id,name,email,picture')->findOrFail($post->id);
return view('your_blade_file_path',compact('posts);
}
In your Post model you should have user relationship also
public function user()
{
return $this->belongsTo( User::class, 'user_id')->withDefault();
}
Note: It is mentioned in Laravel docs.
https://laravel.com/docs/8.x/eloquent-relationships#eager-loading-specific-columns
Note that if you only need one column from the table then using 'lists' is quite nice. In my case i am retrieving a user's favourite articles but i only want the article id's:
$favourites = $user->favourites->lists('id');
Returns an array of ids, eg:
Array
(
[0] => 3
[1] => 7
[2] => 8
)
If you use PHP 7.4 or later you can also do it using arrow function so it looks cleaner:
Post::with(['user' => fn ($query) => $query->select('id','username')])->get();
I faced the same issue while using belongsToMany relationship with my user model (Laravel 8.x.x).
After a long search and trial and test method. I found out this answer
You have to make sure you are selecting the id's and any foreign keys that would be needed for the relationship from either side of that relationship. This allows Eloquent to match up parents to their children.
Original credit goes to https://stackoverflow.com/a/64233242/1551102
So I included
Groups::select('groupid')
...
And it worked like a charm. Although now I want to know how to hide the groupid field after fetching.
I know I can simply loop through the array and remove it. But is there any other method? potentially a simpler and better one.
You can also specify columns on related model at the time of accessing it.
Post::first()->user()->get(['columns....']);
You can try this code . It is tested in laravel 6 version.
Controller code
public function getSection(Request $request)
{
Section::with(['sectionType' => function($q) {
$q->select('id', 'name');
}])->where('position',1)->orderBy('serial_no', 'asc')->get(['id','name','','description']);
return response()->json($getSection);
}
Model code
public function sectionType(){
return $this->belongsTo(Section_Type::class, 'type_id');
}
Be careful that if you don't add the key column(s) it won't return anything. If you want to show only the username without the id you could instead define the $visible/$hidden properties within the Model, like so:
app/Models/User.php
protected $visible = ['username'];
Then it will retrieve only username column with:
Post::with('user')->get();
Hiding the key columns:
Alternatively you could hide the key column(s) and then retrieve only the columns you wish.
app/Models/User.php
protected $hidden = ['id'];
Specify which columns you want including the key or else it won't return anything, but this will actually only return the username, because id is $hidden.
Post::with('user:id,username')->get();
Now you can use the pluckmethod on a Collection instance:
This will return only the uuid attribute of the Post model
App\Models\User::find(2)->posts->pluck('uuid')
=> Illuminate\Support\Collection {#983
all: [
"1",
"2",
"3",
],
}
Try with conditions.
$id = 1;
Post::with(array('user'=>function($query) use ($id){
$query->where('id','=',$id);
$query->select('id','username');
}))->get();
So, similar to other solutions here is mine:
// For example you have this relation defined with "user()" method
public function user()
{
return $this->belongsTo('User');
}
// Just make another one defined with "user_frontend()" method
public function user_frontend()
{
return $this->belongsTo('User')->select(array('id', 'username'));
}
// Then use it later like this
$thing = new Thing();
$thing->with('user_frontend');
// This way, you get only id and username,
// and if you want all fields you can do this
$thing = new Thing();
$thing->with('user');
EmployeeGatePassStatus::with('user:id,name')->get();
Here is my situation: user have list of liked objects and list of disliked.
I want to act like this:
list($cat, $dog) = R::dispense('object', 2);
$user->sharedLikedobjectsList[] = $cat;
$user->sharedDislikedobjectsList[] = $dog;
But afterall RedbeanPhp creates single tabe (object_user) with 2 rows inside.
What shall I do to have 2 different tables and accessible properties on $user bean?
use $bean->link() method to create an alias name for your foreign key table.
such as this :
$user->link("pet",array("some_prop"=>"some_value"))->sharedPet = dog;
UPDATE: Apparently $problem->userRatings()->count(); returns 1, so a record does exist, but the script still doesn't enter the foreach loop for some reason...
UPDATE 2/Solution: I feel incredibly foolish, but the reason it isn't working, is that I was calling foreach($problem->userRatings() as $rating){ when it should be foreach($problem->userRatings as $rating){ (dynamic property)
In my database I have problem_ratings, problems, and users. I have models for users and problems, and problems_ratings is a pivot table between problems and users with an extra 'content' column that stores the numeric rating value (1-5).
The many-to-many relation in my Problem model:
public function userRatings(){
return $this->belongsToMany('User', 'problem_ratings', 'author_id', 'problem_id')->withPivot('content');
}
The many-to-many relation in my User model:
public function problemRatings(){
return $this->belongsToMany('Problem', 'problem_ratings', 'author_id', 'problem_id')->withPivot('content');
}
When creating a problem_ratings element, I attach it to my user model like so:
$user->problemRatings()->attach($problem->id, array('content' => $val));
I can access the pivot table through the user, but when I try this:
foreach($problem->userRatings() as $rating){
echo "In average loop";
$newAverage = ($rating->pivot->content) + $newAverage;
}
it doesn't find any records, even though some exist in the database. Am I using these relations correctly?
Thanks in advance!
In the Problem model I think your relationship should looks something like :
public function userRatings(){
return $this->belongsToMany('User', 'problem_ratings', 'problem_id', 'author_id')->withPivot('content');
}
When using a foreach loop over something like this, you need to use dynamic properties (ie. without parentheses):
foreach($problem->userRatings as $rating){ instead of foreach($problem->userRatings() as $rating){
I have many-to-many relation between two models: movie and actor.
I need to obtain relation ID after saving it, to use it later. Here's the code:
$movie->actors()->save($actor); // it saves my relation
$relationID = 'how to obtain ID of new record in pivot table?';
I did it this way:
In Movie model:
public function actors()
{
return $this->belongsToMany('Actor')
->withPivot('id');
}
And I obtained ID this way:
$relationID = $movie->actors()
->where('actor.id', $actor->id)
->first()->pivot->id;
Ugly, but works. If it can be done any better, please let me know. :)