Laravel 5 inserting row with a foreign key - php

Question

I have two tables Users and Posts.
here is my User table migration file:
public function up()
{
Schema::create('users', function(Blueprint $table)
{
$table->increments('id');
$table->string('name');
$table->string('email')->unique();
$table->string('password', 60);
$table->string('password_temp',60);
$table->integer('active');
$table->string('code',60);
$table->rememberToken();
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::drop('users');
}
and here is my posts table migration file
public function up()
{
Schema::create('posts', function(Blueprint $table){
$table->increments('id');
$table->string('title');
$table->text('body');
$table->integer('user_id')->unsigned();
$table->string('slug');
$table->timestamps();
});
Schema::table('posts',function(Blueprint $table){
$table->foreign('user_id')
->references('id')
->on('users')
->onDelete('cascade')
->onUpdate('cascade');
});
}
AdminPostsController extends Controller{
public function store(Request $request)
{
$validator = Validator::make($request->all(),Post::$rules);
if($validator->passes()){
$post = new Post();
$post->title = $request->get('title');
$post->body = $request->get('body');
$post->user_id = $request->get('id');
$post->slug = Slug::generateSlug($request->get('title'));
$post->save();
return Redirect::route('admin.posts.index');
}
else{
return Redirect::route('admin.posts.create')->withErrors($validator)->withInput();
}
}
}
Every time i insert a new post,i always see the following error
"QueryException in Connection.php line 614:
SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails ('blog'.'posts', CONSTRAINT 'posts_user_id_foreign' FOREIGN KEY ('user_id') REFERENCES 'users' ('id') ON DELETE CASCADE ON UPDATE CASCADE)"
i would like to know what i am doing wrong.

Answer 1

This code creates a constrain so that your post MUST be referenced by a valid user id. The user_id field must contain a existing key on the users table id field.
$table->foreign('user_id')
->references('id')
->on('users')
Try associating the user before saving the new post.
$post = new Post();
$post->title = $request->get('title');
$post->body = $request->get('body');
$post->user()->associate($user);
$post->save();
Assuming that you have a valid user model loaded on the $user var and that you have set the relationship between Users and Posts on the Models.