Fix migration from integer to string to handle polymorphic migration

database/migrations/2016_09_04_180400_create_actionlog_table.php

@@ -18,7 +18,7 @@ class CreateActionlogTable extends Migration
                 $table->integer('user_id')->nullable();
                 $table->string('action_type');
                 $table->integer('target_id')->nullable();  // Was checkedout_to
-                $table->integer('target_type')->nullable(); // For polymorphic thingies
+                $table->string('target_type')->nullable(); // For polymorphic thingies
                 $table->integer('location_id')->nullable();
                 $table->text('note')->nullable();
                 $table->text('filename')->nullable();

database/migrations/2016_09_19_235935_fix_fieldtype_for_target_type.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class FixFieldtypeForTargetType extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('action_logs', function ($table) {
+            $table->string('target_type')->nullable()->default(null)->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('action_logs', function ($table) {
+            $table->integer('target_type')->nullable()->default(null)->change();
+        });
+    }
+}