[REF] web: process views arch in data manager

A refactoring of the js views is in progress.  Those new views are used
in web studio, and this change is part of it. This is necessary to allow
web studio to correctly fetch data from the server when rendering a
preview.  Note: this is necessary for special widgets (status bar,
selection, radio widgets)

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

@@ -6,6 +6,12 @@ var Model = require('web.DataModel');
 var session = require('web.session');
 var utils = require('web.utils');
 
+function traverse(tree, f) {
+    if (f(tree)) {
+        _.each(tree.children, function(c) { traverse(c, f); });
+    }
+}
+
 return core.Class.extend({
     init: function () {
         this.Filters = new Model('ir.filters');
@@ -208,19 +214,46 @@ return core.Class.extend({
      */
     _postprocess_fvg: function (fields_view) {
         var self = this;
+
+        // Parse and process arch
         var doc = $.parseXML(fields_view.arch).documentElement;
+        var fields = fields_view.fields;
         fields_view.arch = utils.xml_to_json(doc, (doc.nodeName.toLowerCase() !== 'kanban'));
+        traverse(fields_view.arch, function(node) {
+            if (typeof node === 'string') {
+                return false;
+            }
+            if (node.tag === 'field') {
+                fields[node.attrs.name].__attrs = node.attrs;
+                if (fields[node.attrs.name].type === 'many2one') { // FIXME: this shouldn't be done here
+                    if (node.attrs.widget === 'statusbar' || node.attrs.widget === 'radio') {
+                        fields[node.attrs.name].__fetch_status = true;
+                    } else if (node.attrs.widget === 'selection') {
+                        fields[node.attrs.name].__fetch_selection = true;
+                    }
+                }
+                if (node.attrs.widget === 'many2many_checkboxes') {
+                    fields[node.attrs.name].__fetch_many2manys = true;
+                }
+                return false;
+            }
+            return node.tag !== 'arch';
+        });
+
+        // Special case for id's
         if ('id' in fields_view.fields) {
-            // Special case for id's
             var id_field = fields_view.fields.id;
             id_field.original_type = id_field.type;
             id_field.type = 'id';
         }
+
+        // Process inner views (one2manys)
         _.each(fields_view.fields, function(field) {
             _.each(field.views || {}, function(view) {
                 self._postprocess_fvg(view);
             });
         });
+
         return fields_view;
     },