Fixed #297

examples/mongoengine/simple.py

@@ -81,7 +81,9 @@ class TodoView(ModelView):
     column_filters = ['done']
 
     form_ajax_refs = {
-        'user': ('name',)
+        'user': {
+            'fields': ('name',)
+        }
     }
 
 

examples/peewee/simple.py

@@ -67,7 +67,9 @@ class PostAdmin(ModelView):
                       User.username)
 
     form_ajax_refs = {
-        'user': (User.username, 'email')
+        'user': {
+            'fields': (User.username, 'email')
+        }
     }
 
 

flask_admin/model/widgets.py

@@ -2,6 +2,7 @@ from flask import url_for, json
 from wtforms.widgets import HTMLString, html_params
 
 from flask.ext.admin._compat import as_unicode
+from flask.ext.admin.babel import gettext
 from flask.ext.admin.form import RenderTemplateWidget
 
 
@@ -51,4 +52,7 @@ class AjaxSelect2Widget(object):
                 kwargs['value'] = data[0]
                 kwargs['data-json'] = json.dumps(data)
 
+        placeholder = gettext(field.loader.options.get('placeholder', 'Please select model'))
+        kwargs.setdefault('data-placeholder', placeholder)
+
         return HTMLString('<input %s>' % html_params(name=field.name, **kwargs))

flask_admin/static/admin/js/form.js

@@ -12,6 +12,7 @@
         var opts = {
           width: 'resolve',
           minimumInputLength: 1,
+          placeholder: 'data-placeholder',
           ajax: {
             url: $el.attr('data-url'),
             data: function(term, page) {