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Foreign Key Constraints 
user_id
column on the 
books_chapter
table references the 
id
column on a 
users
table: 

$table->foreign('book_id')->references('id')->on('books');
$table->foreign('chapter_id')->references('id')->on('texts');
$table->foreign('user_id')->references('id')->on('users');

->onDelete('cascade')
helps us to automatically delete related rows in Laravel 

$table->foreign('book_id')->references('id')->on('books')->onDelete('cascade');
$table->foreign('chapter_id')->references('id')->on('texts')->onDelete('cascade');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
by Luka Tatarishvili
4 years ago
Laravel
database
0
Pro tip: use ```triple backticks around text``` to write in code fences