laravel 5 - How can i add ->index() to existing foreign key - php

Question

Framework: Laravel 5.2
Database: MySQL
PHP: 7.0
I have the table "pops":
Schema::create('pops', function (Blueprint $table) {
$table->string('id')->primary()->index();
$table->string('ab_test_parent_id')->nullable();
$table->string('cloned_parent_id')->nullable();
$table->timestamps();
});
And the table "conversions":
Schema::create('conversions', function (Blueprint $table) {
$table->string('id')->primary()->index();
$table->integer('users')->default(null);
$table->string('name',256)->default(null);
$table->string('pop_id');
$table->foreign('pop_id')->references('id')->on('pops')->onDelete('cascade')->onUpdate('cascade');
$table->timestamps();
});
I have set a foreign key (pop_id) in the "conversions" table. Now does it's mean that the foreign key (pop_id) is also a index? if not... what i need to do in order to make it a index?
Thank?

Answer 1

You can just do this.
<?php
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class AddIndexToLeads extends Migration {
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::table('leads', function(Blueprint $table)
{
$table->index('trader_id');
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::table('leads', function (Blueprint $table)
{
$table->dropIndex(['trader_id']);
});
}
}
credit to #bobbybouwmann

Answer 2

Here is a perfect solution for you.
Up
$table->string('poptin_id')->index('poptin_id');
Down
$table->dropIndex(['poptin_id']);
Suggestion to fix your migrations
$table->string('id')->primary()->index();
replace above with below
$table->increments('id');
and fix your foreign key as below
$table->integer('poptin_id')->index('poptin_id')->unsigned();

Answer 3

I was facing problem when i just write :-
$table->index('column_name');
So to be more exact first you need to create column with desired column type then assign it to be index like this :-
$table->string('column_name');
$table->index('column_name');
//or
$table->string('column_name')->index();
I hope this helps

Answer 4

Laravel only adds a foreign key constraint and doesn't add index implicitly. But some databases such as MySQL automatically index foreign key columns.
If you need to add index to a field in another migration. Then you could do
$table->index('email');