Started change for entities to have concept of owners

database/migrations/2020_12_30_173528_add_owned_by_field_to_entities.php

@@ -0,0 +1,49 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Facades\DB;
+
+class AddOwnedByFieldToEntities extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $tables = ['pages', 'books', 'chapters', 'bookshelves'];
+        foreach ($tables as $table) {
+            Schema::table($table, function (Blueprint $table) {
+                $table->integer('owned_by')->unsigned()->index();
+            });
+
+            DB::table($table)->update(['owned_by' => DB::raw('`created_by`')]);
+        }
+
+        Schema::table('joint_permissions', function (Blueprint $table) {
+            $table->renameColumn('created_by', 'owned_by');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        $tables = ['pages', 'books', 'chapters', 'bookshelves'];
+        foreach ($tables as $table) {
+            Schema::table($table, function (Blueprint $table) {
+                $table->dropColumn('owned_by');
+            });
+        }
+
+        Schema::table('joint_permissions', function (Blueprint $table) {
+            $table->renameColumn('owned_by', 'created_by');
+        });
+    }
+}