Laravel MorphToMany Doesn't Work for multi columns - php

Question

Laravel version: 7.0 Here is my table.
Schema::create('model_email_form', function (Blueprint $table) {
$table->id();
$table->string('model_type');
$table->unsignedBigInteger('model_id');
$table->unsignedBigInteger('email_id');
$table->unsignedBigInteger('form_id');
$table->timestamps();
});
Here is my Service model.
public function forms()
{
return $this->morphToMany(
Form::class,
'model',
'model_email_form',
'model_id',
'form_id'
);
}
public function emails()
{
return $this->morphToMany(
Email::class,
'model',
'model_email_form',
'model_id',
'email_id'
);
}
I inserted data in model_email_form table but when I get service model object, emails and forms have null object.
Can anyone help me?

Answer 1

From your question and comments:
There are Form, Email and Service. Forms can be associated with any number of different types of models. Emails can be associated with any number of different types of models. A Service can have many Forms and a Service can have many Emails.
Using that as the basis, this would be our schema:
Schema::create('forms', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name'); // as an example
...
$table->timestamps();
});
Schema::create('formables', function (Blueprint $table) {
$table->unsignedBigInteger('form_id'); // the id of the form
$table->unsignedBigInteger('formable_id'); // the associated model's id
$table->string('formable_type'); // The associated model's class name
});
Schema::create('emails', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('subject'); // as an example
...
$table->timestamps();
});
Schema::create('emailables', function (Blueprint $table) {
$table->unsignedBigInteger('email_id'); // the id of the email
$table->unsignedBigInteger('emailable_id'); // the associated model's id
$table->string('emailable_type'); // The associated model's class name
});
Schema::create('services', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name'); // as an example
...
$table->timestamps();
});
With that schema, we can create the following models with the following relationships:
class Form extends Model
{
public function services()
{
return $this->morphedByMany(Service::class, 'formable');
}
// Add the other morphedByMany relationships of forms
}
class Email extends Model
{
public function services()
{
return $this->morphedByMany(Service::class, 'emailable');
}
// Add the other morphedByMany relationships of emails
}
class Service extends Model
{
public function forms()
{
return $this->morphedToMany(Form::class, 'formable');
}
public function emails()
{
return $this->morphedToMany(Email::class, 'emailable');
}
}