[IMP] mail, *: template rendering with abstract thread, adapt thread instantiation, thread `getMessages`/`fetchMessages`, and create mode document thread.

* = im_livechat, im_support

- thread widget now uses abstract thread in `render` method
- thread models have their `init` parameters changed, so that the parent may be optional
- reworked 'creating a new record...' in chatter in create mode:
    > new model CreateModeDocumentThread, which basically is a fake document thread
      with a fake message for its rendering in create mode of the chatter
    > special rendering method of thread_widget for such case: `renderChatterCreateMode`
- renamed thread methods previously named `getMessages` to `fetchMessages`:
    > in order to not conflict with `getMessages`, used for rendering
    > now, `getMessages` always get messages that are locally,
      while `fetchMessages` may fetch messages.

TODO:
    - special thread model for im_livechat (rendering is broken ATM)

1 files changed, 28 insertions, 1 deletions

diff --git a/addons/mail/static/src/js/models/threads/abstract_thread.js b/addons/mail/static/src/js/models/threads/abstract_thread.js
index 3ea263fa996..788a04307a7 100644
--- a/addons/mail/static/src/js/models/threads/abstract_thread.js
+++ b/addons/mail/static/src/js/models/threads/abstract_thread.js
@@ -6,15 +6,42 @@ var Class = require('web.Class');
 /**
  * Abstract thread is the super class of all threads, either backend threads
  * (which are compatible with mail service) or website livechats.
+ *
+ * Abstract threads contain abstract messages
  */
 var AbstractThread = Class.extend({
-    init: function (parent, data) {},
+    /**
+     * @param {Object} params
+     * @param {Object} params.data
+     * @param {Object} params.data.id the ID of this thread
+     */
+    init: function (params) {
+        this._id = params.data.id;
+    },
 
     //--------------------------------------------------------------------------
     // Public
     //--------------------------------------------------------------------------
 
+    /**
+     * Get the ID of this thread
+     *
+     * @returns {integer|string}
+     */
+    getID: function () {
+        return this._id;
+    },
+    /**
+     * @abstract
+     * @returns {mail.model.AbstractMessage[]}
+     */
     getMessages: function () {},
+    /**
+     * @returns {boolean}
+     */
+    hasMessages: function () {
+        return !_.isEmpty(this.getMessages());
+    },
 });
 
 return AbstractThread;