3个不同表之间的Laravel关系

Question

Trying to figure out the following:

1. How to set up these tables.
2. The relationship between the tables using eloquent.

Essentially, you can create a post that is tied to a task. Each task can have unique details that would need the users input.

Tables (one way of doing this)

Schema::create('uniqueTopic1', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('post_id');
$table->foreign('post_id')
      ->references('id')
      ->on('posts')
      ->onDelete('cascade');
$table->string('uniqueDetails1');
$table->string('uniqueDetails2');
$table->string('uniqueDetails3');
$table->string('uniqueDetails4');
$table->string('uniqueDetails5');
$table->string('uniqueDetails6');
$table->string('title');
$table->string('description');
$table->string('mission');
$table->int('money');
$table->timestamps();
});

Schema::create('uniqueTopic2', function (Blueprint $table) {
    $table->increments('id');
    $table->unsignedInteger('post_id');
    $table->foreign('post_id')
          ->references('id')
          ->on('posts')
          ->onDelete('cascade');
    $table->string('uniqueDetails1');
    $table->string('uniqueDetails2');
    $table->string('uniqueDetails3');
    $table->int('level');
    $table->timestamps();
});

Schema::create('posts', function (Blueprint $table) {
    $table->increments('id');
    $table->string('title');
    $table->timestamps();
});

Now I want to set this up in a way that I can grow this. As I add more tasks to the site I can dynamically grow that out. Thats why I am thinking of a posts table which references a Task Table which then can go into a details table for that specific task?

First of all is this the right way of setting this up?

Second of all what or how would i tie this together using eloquent? Many to many through? pivot table. This is for an API so its important to be able to build the JSON object ... this is not just getting passed to a view or something like that...

Answer 1

Database Scheme

Schema::create('tasks', function (Blueprint $table) {
    $table->increments('id');
    $table->string('title');
    $table->timestamps();
});

Schema::create('sub_tasks', function (Blueprint $table) {
    $table->increments('id');
    $table->string('title');
    $table->string('description');
    $table->unsignedInteger('task_id');
    $table->foreign('task_id')
          ->references('id')
          ->on('tasks')
          ->onDelete('cascade');
    $table->timestamps();
});

Schema::create('posts', function (Blueprint $table) {
    $table->increments('id');
    $table->string('title');
    $table->unsignedInteger('task_id');
    $table->foreign('task_id')
          ->references('id')
          ->on('tasks')
          ->onDelete('cascade');
    $table->timestamps();
});

Example Code

$task1 = Task::create(['title' => 'Market Shopping']);
$task2 = Task::create(['title' => 'Spring Cleaning']);

// Subtask for Task1
$task1->subTasks()->create([
    'title'       => 'Buy shampoo',
    'description' => 'Around 3 bottles will be good'
]);

$task1->subTasks()->create([
    'title'       => 'Buy donuts',
    'description' => 'I love the sprinkled ones!'
]);

// Subtask for Task2
$task2->subTasks()->create([
    'title'       => 'Recycle old bottles',
    'description' => 'They are in the garage'
]);

$task2->subTasks()->create([
    'title'       => 'Wash car',
    'description' => 'Do not forget the back seat'
]);

Answer 2

@dov

so if i expanded on your idea i would end up with this then... no? Sorry it still is not clicking for me how i would make this work. apologies. I would end up with entries like:

DB entry for subtask 1 and sub task 2

1 | 1 | x | y | z | NULL | NULL | NULL | NULL | NULL | timestamps
2 | 2 | NULL | NULL | NULL | a | b | c | d | timestamps

Tables:

Schema::create('tasks', function (Blueprint $table) {
    $table->increments('id');
    $table->string('title');
    $table->timestamps();
});

Schema::create('sub_tasks', function (Blueprint $table) {
    $table->increments('id');
    $table->unsignedInteger('task_id');
    $table->foreign('task_id')
          ->references('id')
          ->on('tasks')
          ->onDelete('cascade');
    $table->string('task1 specific input1');
    $table->string('task1 specific input2');
    $table->string('task1 specific input3');
    $table->string('task2 specific input1');
    $table->string('task2 specific input2');
    $table->string('task2 specific input3');
    $table->string('task2 specific input4');
    $table->string('task2 specific input5');
    $table->timestamps();
});

Schema::create('posts', function (Blueprint $table) {
    $table->increments('id');
    $table->string('title');
    $table->unsignedInteger('task_id');
    $table->foreign('task_id')
          ->references('id')
          ->on('tasks')
          ->onDelete('cascade');
    $table->timestamps();
});