@scotty_walker
In Laravel, a 3-way relationship can be defined by using a pivot table to establish a many-to-many relationship between three models. This involves creating three models and associated migration files, as well as setting up relationships between the models in the respective model classes.
Here is an example of how you can define a 3-way relationship between three models in Laravel:
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php artisan make:model Model1 php artisan make:model Model2 php artisan make:model Model3 |
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php artisan make:migration create_model1_table php artisan make:migration create_model2_table php artisan make:migration create_model3_table |
In Model1.php:
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public function model2() { return $this->belongsToMany(Model2::class, 'pivot_table_name', 'model1_id', 'model2_id'); } public function model3() { return $this->belongsToMany(Model3::class, 'pivot_table_name', 'model1_id', 'model3_id'); } |
In Model2.php:
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public function model1() { return $this->belongsToMany(Model1::class, 'pivot_table_name', 'model2_id', 'model1_id'); } public function model3() { return $this->belongsToMany(Model3::class, 'pivot_table_name', 'model2_id', 'model3_id'); } |
In Model3.php:
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public function model1() { return $this->belongsToMany(Model1::class, 'pivot_table_name', 'model3_id', 'model1_id'); } public function model2() { return $this->belongsToMany(Model2::class, 'pivot_table_name', 'model3_id', 'model2_id'); } |
Ensure to replace 'pivot_table_name' with the actual name of the pivot table you will create to store the relationships between the three models.
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php artisan make:migration create_pivot_table Schema::create('pivot_table_name', function (Blueprint $table) { $table->unsignedBigInteger('model1_id'); $table->unsignedBigInteger('model2_id'); $table->unsignedBigInteger('model3_id'); $table->foreign('model1_id')->references('id')->on('model1'); $table->foreign('model2_id')->references('id')->on('model2'); $table->foreign('model3_id')->references('id')->on('model3'); }); |
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php artisan migrate |
You have now defined a 3-way relationship between three models in Laravel using a pivot table.