Laravel 5.8 Eloquent Model Relationship error - laravel

I have a relationship between two models, User and Follower.
User hasMany Follower, and Follower belongsTo User.
In my followers table in the database I have two columns, follower_id and following_id. Both these columns refer to the id column in the users table.
My follower and users table
followers
id
follower_id
following_id
users
id
name
username
User Model
public function followers(){
return $this->hasMany('App\Follower', 'follower_id');
}
public function followings(){
return $this->hasMany('App\Follower', 'following_id');
}
Follower Model
public function user(){
return $this->belongsTo('App\User');
}
In a test controller I am doing this:
$followed = Follower::find(2);
From here, I would like to select one of the columns, follower_id or following_id, and access the user that this particular row belongs to by using $followed->user->name. How would I go about that? Since I need to select a column before accessing, I am a little bit confused.
What can I do to access the data I need?

Your table should be :
followers
id
follower_id
following_id
user_id
users
id
name
username
In your Follower model :
public function user()
{
return $this->hasMany(Follower::class, 'user_id');
}
In your User model :
public function follower()
{
return $this->belongsTo(User::class, 'user_id');
}
Then you can query like this :
$follower = Follower::with('user')->findorFail(2);
$user_name = $follower->user->name;

Related

Relationship between user and store

I need to create a relationship between user and many stores. I have created a three models
Store Model
id name email phone info
1 xyz xyz#gmail.com 9329292922 Small Store
2 abc abc#gmail.com 9494949449 Some Store
User Model
id name email
1 ewd ewd#gmail.com
2 xcv xcv#gmail.com
User_Store
user_id store_id
1 1
1 2
What does the user_store model contain relations whether it is belongstoMany or hasmany?
You can use belongsToMany relationship
In your Store model define a method
public function users() {
return $this->belongsToMany(Users::class, 'user_store', 'user_id', 'store_id');
}
In your Users model define a method
public function stores() {
return $this->belongsToMany(Stores::class, 'user_store', 'user_id', 'store_id');
}
Looks to me like you want a simple many-to-many relationship.
For this you only need two models User and Store, you only need StoreUser if you want to do something special with the pivot table otherwise it is unnecessary.
The following would be the Laravel way:
Table structure
stores
id
name
email
phone
info
users
id
name
email
store_user
user_id
store_id
Laravel excepts the pivot table to be called store_user, you can read more about it here:
To define this relationship, three database tables are needed: users,
roles, and role_user. The role_user table is derived from the
alphabetical order of the related model names, and contains the
user_id and role_id columns.
Model structure
class User extends Model
{
public function stores()
{
return $this->belongsToMany(Store::class);
}
}
class Store extends Model
{
public function users()
{
return $this->belongsToMany(User::class);
}
}

How to create relationship in Laravel 5 which will collect records of own model mentioned in pivot table?

I have 3 tables users, companies and pivot table with user_id, company_id.
I can't get users, which belongs to my company inside User model.
Tried like
belongsToMany('App\User','companies_users','company_id','user_id' );
but I get relation with wrong users.
Since you are having a belongsToMany relationship between the User and Company, the User belongs to more than one Company. To get users of the companies of a particular User will not be straight forward. If you are sure that is exactly what you want, then do this:
//inside the User model
public function companies()
{
return $this->belongsToMany('Company');
}
//inside the User model
public function companiesusers()
{
$users= new Illuminate\Database\Eloquent\Collection;
foreach($this->companies as $company)
{
$users = $users->merge($company->users->get());
}
return $users->unique();
}
//inside the Company model
public function users()
{
return $this->belongsToMany('User');
}
Then you can get a user's companiesusers like so:
User::first()->companiesusers();

A department can belongsToMany, but a user can only belongTo department? How to pivot this correctly?

So im trying to figure out how to use pivot tables in Laravel. And I have tried to read and understand the documentation. And I cannot understand why a user just can't balongTo a "department". I don't want a user to belongToMany "departments".
Departments model
public function users()
{
return $this->belongsToMany(User::class, 'department_user', 'user_id', 'department_id');
}
And for the user model, I want something like
public function department()
{
return $this->belongsTo(Department::class);
}
But Laravel reports null. Because department_id doesn't exist in the users row? How can I reverse this pivot table lookup, with belongsToMany and belongsTo?
I think you're getting confused with your relationship types. If I understand you correctly:
A Department hasMany Users.
A User belongsTo a Department.
This one-to-many relationship type does not need a pivot table and can be written as such:
class Department extend Eloquent
{
public function users()
{
return $this->hasMany(User::class);
}
}
class User extend Eloquent
{
public function department()
{
return $this->belongsTo(Department::class);
}
}
This would require that the users table have a department_id foreign key.

User to User Model: One to Many Relationship on Laravel

I'm doing a project for one of my University courses. But I'm finding it difficult to make relationship between User to User model.
Table: users
id
name
email
type
password
On this table the column type is used for classifying user types.
For example: User can be either distributor or dealer type.
And a distributor may have many dealer
But a dealer may have only one distributor.
To implement this I've created another table and named as dealers_of_distributor.
Table: dealers_of_distributor
id
distributor_id (id of users table)
dealer_id (id of users table)
Although I've used an additional model DelaersOfDistributor, the exact relationship should be between user to user.
How can I make this relationship. I'm confused!
I've tried so far:
Model: User
public function dealersOfDistributor(){
$this->hasMany('App\DealersOfDistributor');
}
Model: DealersOfDistributor
public function user(){
return $this->belongsTo('App\User');
}
The DistributorsController
public function index()
{
$distributors=User::where('type', 'distributor')->get();
$dealers=User::where('type', 'dealer')->get();
$assignedDealers=DealersOfDistributor::all();
return view('distributors.index')->withDistributors($distributors)->withDealers($dealers)->with('assignedDealers', $assignedDealers);
}
In blade file: I've tried $assignedDealer->dealer_id->user->name. But It's showing error.
Model DealersOfDistributor:
public function distributorUser()
{
return $this->belongsTo('App\User', 'distributor_id', 'id');
}
public function dealerUser()
{
return $this->belongsTo('App\User', 'dealer_id', 'id');
}
than you just get the user's data from DealersOfDistributor model, call function dealerUser if you want get user's data from dealer_id, and call function distributionUser if you want get user's data from distribution_id
Controller:
public function index()
{
$assignedDealers=DealersOfDistributor::all();
return view('distributors.index',compact('assignedDealers'));
}
Blade get username:
#foreach($assignedDealers as $assign)
{{$assign->distributorUser->name}}
{{$assign->dealerUser->name}}
#endforeach

Eloquent Relationship with Laravel 5.4

I have the following Models with corresponding tables:
User (users), UserProfile (user_profiles), Review (reviews)
Schema
table: users
user_id (primary key)
first_name
last_name
table: user_profiles
user_id (foreign key)
country
phone
table: reviews
reviewer_id (the user who posted the review)
user_id (foreign key)
body
I query the database with the following:
$user = User::with('profile', 'review')->find(Auth::User()->user_id);
Part of User Model
public function profile(){
return $this->hasOne(UserProfile::class, 'user_id');
}
public function review(){
return $this->hasOne(Review::class, 'user_id');
}
Part of UserProfile Model
public function users() {
return $this->belongsTo(User::class, 'user_id');
}
Part of Review Model
public function users() {
return $this->belongsTo(User::class, 'user_id');
}
How can I access the details of the reviewer using the reviewer_id from the users table
As a sunup of what was discussed in this question, I think the major concern of OP was regarding a table that have 2 foreign keys with the same table. Both user_id and reviewer_id are foreign keys linked to the users table.
One important thing to understand about Laravel relationships is that the relationship name is not hard bound, it can be anything as long as it makes sense to you. The related object will be available in the ATTRIBUTE with the exact name of the METHOD.
class User extends Model {
public function review() {
return $this->hasOne(Review::class);
}
}
A user's review will be available at User::find(1)->review;.
class Review extends Model {
public function owner() {
return $this->belongsTo(User::class, 'user_id');
}
public function reviewer() {
return $this->belongsTo(User::class, 'reviewer_id');
}
}
From a review, you will be able to access both users:
Review::find(1)->owner; // This is the relationship with user_id column
Review::find(1)->reviewer; // This is the relationship with reviewer_id column

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