firefly-iii/app/database/migrations/2014_11_29_140217_transactiongroupsjoin.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;

class Transactiongroupsjoin extends Migration
{

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        //
        Schema::drop('transaction_group_transaction_journal');
    }

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {

        Schema::create(
            'transaction_group_transaction_journal', function (Blueprint $table) {
                $table->increments('id');
                $table->integer('transaction_group_id')->unsigned();
                $table->integer('transaction_journal_id')->unsigned();

                $table->foreign('transaction_group_id','tr_grp_id')->references('id')->on('transaction_groups')->onDelete('cascade');
                $table->foreign('transaction_journal_id','tr_trj_id')->references('id')->on('transaction_journals')->onDelete('cascade');

                $table->unique(['transaction_group_id','transaction_journal_id'],'tt_joined');
            });
    }

}