Laravel / MySql Unique String Based On Id? - php

Question

I have the following migration to create my MySQL database table
public function up()
{
Schema::create('project_auth_keys', function (Blueprint $table) {
$table->increments('id');
$table->integer('project_id')->unsigned();
$table->string('key', 800);
$table->string('first_name', 80);
$table->string('last_name', 80);
$table->timestamps();
// link project id with real project id
$table->foreign('project_id')->references('id')->on('projects');
});
}
Now what I want ot accomplish is make 'key' "unique"... However I know that I can do that by simply changing
$table->string('key', 800)->unique();
But I don't want to make it unique for the whole table I want to make it unique based on project_id.
For example a entry with project_id of 1 and a entry with project_id of 2 can have the same key, however there cannot be 2 same keys in the same project_id.
Is this something I can do within MySQL or will I have to make this as a rule within my controller? I can do it in my controller not a problem, but I would rather do it in my database if possible.
EDIT
Tried adding
$table->primary(array('project_id', 'key'));
Added it right below $table->primary(array('project_id', 'key'));
However after doing this I am getting a error when trying to run the migration.

Answer 1

Something like this?
$table->primary(array('project_id', 'key'));
You can find the same in the documentation here.
Solution 1: Since you already have a increment column defined, it is taking the same as a default primary key.
To use a composite primary key, you can either remove that column or calculate that column differently, otherwise it would throw you a duplicate primary key exception.
Also, the limitation of the length of primary key is "767" and hence you should reduce your key length to lower than that if possible.
I just tried the following and it works:
Schema::create('test', function(Blueprint $table)
{
$table->integer('project_id')->unsigned();
$table->string('key', 100); // make sure the key length is within sql standards(767), "800" is not acceptable for primary key
$table->string('first_name', 80);
$table->string('last_name', 80);
$table->timestamps();
// Add primary
$table->primary( array( 'key', 'project_id' ) );
});
Solution 2: You can just perform the validation in controller, that gives you more flexibility I believe and have the same structure, with just id as primary key. However, I am not very confident about performance. You will have to check on that.
Hope this helps.