Laravel find records through intermediate table - php

Question

I have 3 models:
User
Company
Enquiry
A user can own more than one company, a company can only belong to one user. An enquiry can belong to many companies and a company can have many enquiries.
The migrations look as follows:
User migration
Schema::create('users', function (Blueprint $table) {
$table->increments('id');
$table->string('first_name');
$table->string('last_name');
$table->string('email')->unique();
$table->timestamp('email_verified_at')->nullable();
$table->string('contact_number');
$table->longText('address')->nullable();
$table->integer('postal_code');
$table->string('activation_token')->nullable();
$table->boolean('active')->default(false);
$table->enum('type', ['Admin', 'End User', 'Service Provider', 'Broker']);
$table->string('password')->nullable();
$table->rememberToken();
$table->timestamps();
$table->softDeletes();
});
Company Migration
Schema::create('companies', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('service_provider_id')->nullable();
$table->unsignedInteger('broker_id');
$table->string('name');
$table->string('email')->unique()->nullable();
$table->string('contact_number');
$table->longText('address')->nullable();
$table->integer('postal_code');
$table->enum('status', ['Confirmed', 'Declined', 'New'])->default('New');
$table->timestamps();
$table->softDeletes();
});
Schema::table('companies', function (Blueprint $table) {
$table->foreign('service_provider_id')->references('id')->on('users');
$table->foreign('broker_id')->references('id')->on('users');
});
Enquiries Migration
Schema::create('enquiries', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('end_user_id');
$table->unsignedInteger('category_id');
$table->string('title');
$table->longText('description');
$table->integer('radius');
$table->enum('status', ['New', 'In Progress', 'Complete'])->default('New');
$table->timestamps();
});
Schema::table('enquiries', function (Blueprint $table) {
$table->foreign('end_user_id')->references('id')->on('users');
$table->foreign('category_id')->references('id')->on('categories');
});
CompanyEnquiry Migration
Schema::create('company_enquiry', function (Blueprint $table) {
$table->integer('company_id')->unsigned()->index();
$table->foreign('company_id')->references('id')->on('companies')->onDelete('cascade');
$table->integer('enquiry_id')->unsigned()->index();
$table->foreign('enquiry_id')->references('id')->on('enquiries')->onDelete('cascade');
$table->primary(['company_id', 'enquiry_id']);
});
I have set up the various relationships in their respective models.
What I'm trying to achieve is query the database to retrieve only those enquiries which belong to the user via the company.
How can I achieve this?

Answer 1

Something like this (add the real model, relation names ans columns):
$enquiries = Enquiries::whereHas(['companies' => function($query){
$query->whereHas(['user' => function($query){
$query->where('id', $user_id);
}]);
})
->get();

Answer 2

You could do it this way with shorter code.
$enquiries = Enquiries::whereHas('companies.user', function($query) use($user_id){
$query->where('id', $user_id);
})->get();