Laravel 5.1 Foreign Key Trouble - php

Question

I have some trouble getting the foreign key.
My Migrations looks like this (shortened them):
<?php
class CreateProductsTable extends Migration
{
public function up()
{
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
$table->string('email');
$table->string('title');
$table->string('filename');
$table->integer('number_of_chapters');
$table->text('input_mpg');
$table->timestamps();
});
}
public function down()
{
Schema::drop('products');
}
}
<?php
class CreateChaptersTable extends Migration
{
public function up()
{
Schema::create('chapters', function (Blueprint $table) {
$table->increments('id');
$table->integer('product_id')->unsigned();
$table->time('input-chapter-start1');
$table->time('input-chapter-end1');
$table->timestamps();
});
Schema::table('chapters', function($table) {
$table->foreign('product_id')->references('id')->on('products');
});
}
public function down()
{
Schema::drop('chapters');
}
}
And my 2 Model like this:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Chapters extends Model
{
protected $table = 'chapters';
protected $fillable = ['input-chapter-start1', 'input-chapter-end1'];
public function product()
{
return $this->belongsTo('App\Product');
}
}
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Product extends Model
{
protected $table = 'products';
protected $fillable = ['email', 'title', 'filename', 'inputMpg', 'number_of_chapters'];
public static $rules = [
'email' => 'required|email|max:50',
'title' => 'required|max:50',
'filename' => 'required|max:50',
'input_mpg' => 'required'
];
public function Chapters()
{
return $this->hasMany('App\Chapters');
}
}
And just save it like this in my Controller
$product->save();
$Chapters->save();
And get following error:
SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or
update a child row: a foreign key constraint fails
(generator.chapters, CONSTRAINT chapters_product_id_foreign
FOREIGN KEY (product_id) REFERENCES products (id)) (SQL: insert
into chapters (input-chapter-start1, input-chapter-end1,
updated_at, created_at) values (12:12:12, 12:12:12, 2016-04-25
11:41:31, 2016-04-25 11:41:31))
EDIT
Controller looks like this:
namespace App\Http\Controllers;
class ProductController extends Controller
{
protected $request;
public function request(Request $request)
{
$this->request = $request;
}
public function createProduct(Request $request)
{
$product = new Product;
$Chapters = new Chapters($request->all());
$data = $request->all();
$projectEmail = $request->input('email');
$projectTitle = $request->input('title');
$projectFile = $request->input('filename');
$projectChapters = $request->input('number_of_chapters');
$validator = Validator::make($request->all(), Product::$rules);
if($validator->fails())
{
return Redirect::back()->withInput()->withErrors($validator);
}
$product->fill($data);
if($product->save())
{
$Chapters->product()->associate($product);
$Chapters->save();
return redirect()->route('root')->with('message', 'success')->withInput();
}
else
{
return redirect()->route('newProduct')->with('message', 'Error')->withInput();
}
}
}
Edit I tried Samsquanch suggestion:
And added this in my controller:
$product->save();
$Chapters->product()->associate($product);
$Chapters->save();
but still get this error message:
BadMethodCallException in Builder.php line 2093: Call to undefined
method Illuminate\Database\Query\Builder::products()

Answer 1

The problem is that you're not telling Laravel or MySQL what the foreign key should be.
You have two options here (both from the documentation: https://laravel.com/docs/5.1/eloquent-relationships#inserting-related-models)
The first option would be to save chapters through product:
$chapters = $product->chapters()->saveMany($Chapters); // or just->save() if it's only one
The second (and how I generally do it) would be to use associate() which relies on the belongsTo relationship in your Chapters model:
$product->save();
$Chapters->product()->associate($product);
$Chapters->save();
There's also a third, but not recommended, option of just setting the foreign key yourself manually.
Edit:
$product->chapters()->associate($Chapters);
$product->save();