Laravel migration: “Foreign key constraint is incorrectly formed” (errno 150)

Question

When migrating my DB, this error appears. Below is my code followed by the error that I am getting when trying to run the migration.

Code

Answer 1

I had to face the same problem at Larvel 6. I solve this following way.

I think it helps you or others:

$table->increments('id');
    $table->bigInteger('user_id')->unsigned(); //chnage this line
    $table->bigInteger('category_id')->unsigned(); //change this line
    ---
    $table->foreign('user_id')
        ->references('id')
        ->on('users')
        ->onDelete('cascade');
    $table->foreign('category_id')
        ->references('id')
        ->on('categories')
        ->onDelete('cascade');

Incrementing ID using a "big integer" equivalent.

used bigInteger instead of Integer

2. If still now you got an error.

I suggest you reorder your migration file following ways:

Change the dates that form the first part of the migration filenames So they're in the order you want (example: for 2020_07_28_133303_update_categories.php, the date & time is 2020-07-28, 13:33:03);

N.B: First must be 'categories' migration file than 'meals' migration File.