Laravel migration foreign key issue

Question

I have created categories table using categories migration and then i am trying to create products table using another migration with foreign key categories_id in products t

Answer 1

You may try this (Notice unsigned and references you have used reference):

// unsigned() should be used during declaration
$table->integer('category_id')->unsigned();

// reference() should be references()
$table->foreign('category_id')->references('id')->on('categories');

Update:

At first create the products table then add foreign key. Remove the following line when creating the table:

$table->foreign('category_id')->references('id')->on('categories');

Then add foreign key using this:

Schema::table('products', function($table) {
    $table->foreign('category_id')->references('id')->on('categories');
});

Both should be different like this:

Schema::create('products', function(Blueprint $table)
{
    $table->increments('id');
    $table->integer('category_id')->unsigned();
    $table->string('product_name');
    // more ...
});

Schema::table('products', function($table) {
    $table->foreign('category_id')->references('id')->on('categories');
});