Ability to edit group member permissions

app/assets/javascripts/behaviors/toggler_behavior.coffee

@@ -11,3 +11,8 @@ $ ->
     container = $(".js-toggle-visibility-container")
     container.toggleClass("hide")
     e.preventDefault()
+  
+  $("body").on "click", ".js-toggle-button", (e) ->
+    $(@).disableButton()
+    $(@).closest(".js-toggle-container").find(".js-toggle-content").show()
+    e.preventDefault()

app/assets/javascripts/extensions/jquery.js.coffee

@@ -7,3 +7,7 @@ $.fn.enableButton = ->
   $(@).removeAttr('disabled').
     removeClass('disabled')
 
+$.fn.disableButton = ->
+  $(@).attr('disabled', 'disabled').
+    addClass('disabled')
+

app/controllers/users_groups_controller.rb

@@ -13,7 +13,8 @@ class UsersGroupsController < ApplicationController
   end
 
   def update
-    # TODO: implement
+    @member = @group.users_groups.find(params[:id])
+    @member.update_attributes(params[:users_group])
   end
 
   def destroy

app/views/users_groups/_users_group.html.haml

 - user = member.user
 - return unless user
-%li{class: dom_class(member)}
+%li{class: "#{dom_class(member)} js-toggle-container", id: dom_id(member)}
   = image_tag gravatar_icon(user.email, 16), class: "avatar s16"
   %strong= user.name
   %span.cgray= user.username
@@ -8,12 +8,16 @@
     %span.label.label-success It's you
 
   %span.pull-right
-    - if @group.owners.include?(user)
-      %span.label.label-info Group Owner
-    - else
-      = member.human_access
+    %strong= member.human_access
 
     - if show_controls && user != @group.owner && user != current_user
+      = link_to '#', class: "btn-tiny btn js-toggle-button", title: 'Edit access level' do
+        %i.icon-edit
       = link_to group_users_group_path(@group, member), confirm: remove_user_from_group_message(@group, user), method: :delete, remote: true, class: "btn-tiny btn btn-remove", title: 'Remove user from group' do
         %i.icon-minus.icon-white
 
+  .edit-member.hide.js-toggle-content
+    = form_for [@group, member], remote: true do |f|
+      .alert.prepend-top-20
+        = f.select :group_access, options_for_select(UsersGroup.group_access_roles, member.group_access)
+        = f.submit 'Save', class: 'btn btn-save'

app/views/users_groups/update.js.haml

+:plain
+  $("##{dom_id(@member)}").replaceWith('#{escape_javascript(render(@member, member: @member, show_controls: true))}');