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How to avoid duplicate entries in pivot table in Laravel

We can define foreign key columns with composite keys (multiple columns with primary key definition) which have unique value properties. In this way, we can avoid duplicate entries in the pivot table in Laravel.

Answers 3

Create if not exists and update record if exists in pivot table with extra column using attach and updateExistingPivot method in Laravel

--PATH routes\web.php

Route::get('/save-or-update-pivot-table-record', function(){
    $user = App\Models\User::find(1);
    $project = App\Models\Project::find(1);

    if (!$user->projects->contains($project->id)) {
        $user->projects()->attach($project->id, ['is_manager'=> 1]) ;
    }else{
        $user->projects()->updateExistingPivot($project->id, ['is_manager'=> 0]);
    }
});

This code snippet will help you to create a record in pivot table with extra column if record is not already exists in it and update record if exists in pivot table.

Projects method with belongsToMany relation

app\Models\User.php

public function projects(){
    return $this->belongsToMany('App\Models\Project')
                ->withPivot('is_manager')
                ->withTimestamps();
}

Create if not exists and update record if exists in pivot table with additional column using sync method

--PATH routes\web.php
```
Route::get('/save-or-update-pivot-table-record', function(){
    $user = App\Models\User::find(1);
    $project = App\Models\Project::find(1);
    $user->projects()->sync([$project->id => ['is_manager'=> 1]], false);
});
```
0

This code snippet will help you to create a new record if the record is not already exist in pivot table else it will update the existing record from table.

Create pivot table with composite key in Laravel

// Run migration command to create pivot table
php artisan make:migration create_project_user_table --create=project_user

// Add columns to migration file
public function up()
{
    Schema::create('project_user', function (Blueprint $table) {
        $table->foreignId('user_id')->constrained();
        $table->foreignId('project_id')->constrained();
        $table->boolean('is_manager')->default(false);
        $table->primary(['user_id', 'project_id']);
        $table->timestamps();
    });
}
// Run migration command 

php artisan migrate

// App\Models\User.php
//Create projects() method with belongsToMany Relationship in - App\Models\User.php

public function projects(){
    return $this->belongsToMany('App\Models\Project')
                ->withPivot('is_manager')
                ->withTimestamps();
}

// app\Http\Controllers\<YourController>.php
// Code under controller&rsquo;s method

$user = User::findOrFail(2);
$projectIds = array('1', '2');
try{
    $user->projects()->attach($projectIds, ['is_manager'=>1]);
}catch(\Exception $e){
    return $e->getMessage();
}

This code snippet will insert the value in the pivot table if the value of both column user_id and project_id is unique else it will give SQL error SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '1-2' for key 'PRIMARY'. So it avoids duplicate data entry in a table with a combination of user_id and project_id columns.

In the Pivot table, project_id and user_id columns have been set as the primary keys so there cannot be duplicates with both the same user_id and project_id.

To create project model and table structure of project table visit here - Create project table with model and migration .

If you want to get code snippets to create pivot table for projects and users tables you can visit here - create pivot table for projects and users table .

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How to avoid duplicate entries in pivot table in Laravel

Create if not exists and update record if exists in pivot table with extra column using attach and updateExistingPivot method in Laravel

Projects method with belongsToMany relation

Create if not exists and update record if exists in pivot table with additional column using sync method

Create pivot table with composite key in Laravel

To create project model and table structure of project table visit here - Create project table with model and migration .

If you want to get code snippets to create pivot table for projects and users tables you can visit here - create pivot table for projects and users table .