Laravel 5.2 : `php artisan migrate` 's error - php

Question

I am using Laravel 5.2 ,there is an error when I run php artisan migrate,as follows:
2016_06_12_134655_create_categories_table.php
public function up() {
Schema::create('categories', function(Blueprint $table) {
$table->increments('id');
$table->string('category');
$table->timestamps();
});
}
2016_06_12_134659_create_goods_table.php
public function up() {
Schema::create('goods', function(Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('unit_price');
$table->integer('user_id')->unsigned();
$table->tinyInteger('category_id')->unsigned();
$table->foreign('user_id')->references('id')->on('users');
$table->foreign('category_id')->references('id')->on('categories');
$table->timestamps();
});
}
$php artisan migrate
what should I do?

Answer 1

It might be complaining about your use of tinyInteger on category_id, try setting it to integer as well - assuming your categories table exists. If it does not, you need to make sure any migrations with a foreign key constraint have their related tables migrated before them. Without seeing your categories table, I might wonder whether the datatype for your id is the same as well.

Answer 2

The referenced table categories has a primary key of type int. Keep the same in the referencing column category_id if You want to keep foreign key constraints, defined in line:
$table->foreign('category_id')->references('id')->on('categories');

Answer 3

When you use primary key $table->Increments('id');
you should use Integer as a foreign key
$table-> unsignedInteger('fk_id');
$table->foreign('fk_id')->references('id')->on('table_name');
When you use primary key $table->tinyIncrements('id');
you should use unsignedTinyInteger as a foreign key
$table-> unsignedTinyInteger('fk_id');
$table->foreign('fk_id')->references('id')->on('table_name');
When you use primary key $table->smallIncrements('id');
you should use unsignedSmallInteger as a foreign key
$table-> unsignedSmallInteger('fk_id');
$table->foreign('fk_id')->references('id')->on('table_name');
When you use primary key $table->mediumIncrements('id');
you should use unsignedMediumInteger as a foreign key
$table-> unsignedMediumInteger('fk_id');
$table->foreign('fk_id')->references('id')->on('table_name');