[FIX] web: image widget is dependent on its record's last_update

As a way to optimize loading, images are not necessarily fetched in db.
They have, in their url a "unique" parameter, which is the last_update date on **the record** and controls on the python-side whether it should get the image from a cache or from the db.

Before this commit, this __last_update field wasn't present in the view, so it wasn't fetched, and writes on a model's image worked but did not refresh.
The image displayed was the old one.

After this commit, when the image field widget is present, we force the loading of the __last_update field of the record.
Upon update, the image displayed is the new one.

OPW 777552

addons/web/static/src/js/fields/basic_fields.js

@@ -20,6 +20,7 @@ var framework = require('web.framework');
 var session = require('web.session');
 var utils = require('web.utils');
 var view_dialogs = require('web.view_dialogs');
+var field_utils = require('web.field_utils');
 
 var qweb = core.qweb;
 var _t = core._t;
@@ -1159,6 +1160,10 @@ var AbstractFieldBinary = AbstractField.extend({
 });
 
 var FieldBinaryImage = AbstractFieldBinary.extend({
+    fieldDependencies: _.extend({}, AbstractFieldBinary.prototype.fieldDependencies, {
+        __last_update: {type: 'datetime'},
+    }),
+
     template: 'FieldBinaryImage',
     placeholder: "/web/static/src/img/placeholder.png",
     events: _.extend({}, AbstractFieldBinary.prototype.events, {
@@ -1182,7 +1187,7 @@ var FieldBinaryImage = AbstractFieldBinary.extend({
                     id: JSON.stringify(this.res_id),
                     field: this.nodeOptions.preview_image || this.name,
                     // unique forces a reload of the image when the record has been updated
-                    unique: (this.recordData.__last_update || '').replace(/[^0-9]/g, ''),
+                    unique: (this.recordData.__last_update && field_utils.format.datetime(this.recordData.__last_update) || '').replace(/[^0-9]/g, ''),
                 });
             }
         }

addons/web/static/src/js/services/data_manager.js

@@ -268,7 +268,6 @@ return core.Class.extend({
     _processField: function (viewType, field, attrs) {
         var self = this;
         attrs.Widget = this._getFieldWidgetClass(viewType, field, attrs);
-
         if (!_.isObject(attrs.options)) { // parent arch could have already been processed (TODO this should not happen)
             attrs.options = attrs.options ? pyeval.py_eval(attrs.options) : {};
         }
@@ -388,6 +387,11 @@ return core.Class.extend({
                 }
             }
         }
+
+        if (attrs.Widget.prototype.fieldDependencies) {
+            attrs.fieldDependencies = attrs.Widget.prototype.fieldDependencies;
+            }
+
         return attrs;
     },
     /**
@@ -414,6 +418,15 @@ return core.Class.extend({
             if (node.tag === 'field') {
                 fieldsInfo[node.attrs.name] = self._processField(viewType,
                     fields[node.attrs.name], node.attrs ? _.clone(node.attrs) : {});
+
+                if (fieldsInfo[node.attrs.name].fieldDependencies) {
+                    var deps = fieldsInfo[node.attrs.name].fieldDependencies;
+                    for (var dependency_name in deps) {
+                        if (!(dependency_name in fieldsInfo)) {
+                            fieldsInfo[dependency_name] = {'name': dependency_name, 'dependency_of': node.attrs.name};
+                        }
+                    }
+                }
                 return false;
             }
             return node.tag !== 'arch';