#52 Change to make the owner of the message the recipient and to add

the Entity Reference Prepopulate module.

sites/all/modules/contrib/entityreference_prepopulate/README.txt

@@ -0,0 +1,42 @@
+Description
+===========
+Allows the contents of an "Entity Reference" field to be pre-populated by
+taking a parameter from the URL path.
+
+Install
+=======
+1. Download and enable the module.
+2. Visit admin/structure/types/manage/[ENTITY-TYPE]/fields/[FIELD-NAME]
+3. Enable "Entity reference prepopulate" under the instance settings.
+
+
+Configuration
+=============
+Enable Entity reference prepopulate:
+  Check this to enable Entity reference prepopulate on this field.
+Action
+  Using the select box choose the action to take if the entity reference
+  field is pre-populated.
+Fallback behaviour
+  Select what to do if the URL path does NOT contain a parameter to
+  pre-populate the field.
+Skip access permission
+  This is a fallback override, the fallback behaviour will not be followed
+  for users with the specified permission.
+
+Usage
+=====
+In order to pre-populate an entity reference field you have to supply the
+parameter in the URL.
+
+The structure is
+node/add/article?[field_ref]=[id]
+
+Where [field_ref] is the name of the entity reference field and [id] is
+the id of the entity being referenced.
+
+Examples:
+node/add/article?field_foo=1
+node/add/page?field_bar=1,2,3
+
+

sites/all/modules/contrib/entityreference_prepopulate/entityreference_prepopulate.api.php

@@ -0,0 +1,46 @@
+<?php
+
+
+/**
+ * @file
+ * Hooks provided by the Entity reference prepopulate module.
+ */
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * Register a new prepopulate provider.
+ *
+ * @return
+ *   Array of providers keyed by the provider name, and the following as value:
+ *   - title: The title of the provider.
+ *   - description: The description of the provider.
+ *   - callback: The function that will be called to get the values.
+ *   - disabled: (optional), determines if the provider should be disabled.
+ */
+function hook_entityreference_prepopulate_providers_info() {
+  return array(
+    'url' => array(
+      'title' => t('URL'),
+      'description' => t('Prepopulate from URL'),
+      'callback' => 'entityreference_prepopulate_get_values_from_url',
+    ),
+  );
+}
+
+/**
+ * Alter providers list.
+ *
+ * @param $providers
+ *   Array keyed by the provider name, and and array of values.
+ */
+function entityreference_prepopulate_providers_info_alter(&$providers) {
+  $providers['url']['disabled'] = TRUE;
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */

sites/all/modules/contrib/entityreference_prepopulate/entityreference_prepopulate.info

@@ -0,0 +1,14 @@
+name = Entity reference prepopulate
+description = Prepopulate entity reference values from URL.
+core = 7.x
+package = Fields
+dependencies[] = entityreference
+
+files[] = entityreference_prepopulate.test
+
+; Information added by Drupal.org packaging script on 2014-02-19
+version = "7.x-1.5"
+core = "7.x"
+project = "entityreference_prepopulate"
+datestamp = "1392845305"
+