Prevent database query each time we render group avatar

app/helpers/application_helper.rb

@@ -86,15 +86,6 @@ module ApplicationHelper
     end
   end
-  def group_icon(group_path)
-    group = Group.find_by(path: group_path)
-    if group && group.avatar.present?
-      group.avatar.url
-    else
-      image_path('no_group_avatar.png')
-    end
-  end
-
   def avatar_icon(user_email = '', size = nil)
     user = User.find_by(email: user_email)

app/helpers/groups_helper.rb

@@ -40,4 +40,16 @@ module GroupsHelper
       false
     end
   end
+
+  def group_icon(group)
+    if group.is_a?(String)
+      group = Group.find_by(path: group)
+    end
+
+    if group && group.avatar.present?
+      group.avatar.url
+    else
+      image_path('no_group_avatar.png')
+    end
+  end
 end

app/helpers/namespaces_helper.rb

@@ -28,7 +28,7 @@ module NamespacesHelper
   def namespace_icon(namespace, size = 40)
     if namespace.kind_of?(Group)
-      group_icon(namespace.path)
+      group_icon(namespace)
     else
       avatar_icon(namespace.owner.email, size)
     end

app/views/admin/groups/show.html.haml

@@ -12,7 +12,7 @@
         Group info:
       %ul.well-list
         %li
-          = image_tag group_icon(@group.path), class: "avatar s60"
+          = image_tag group_icon(@group), class: "avatar s60"
         %li
           %span.light Name:
           %strong= @group.name

app/views/dashboard/groups/index.html.haml

@@ -27,7 +27,7 @@
               %i.fa.fa-sign-out
               Leave
-        = image_tag group_icon(group.path), class: "avatar s40 avatar-tile"
+        = image_tag group_icon(group), class: "avatar s40 avatar-tile"
         = link_to group, class: 'group-name' do
           %strong= group.name

app/views/groups/edit.html.haml

@@ -12,7 +12,7 @@
       .form-group
         .col-sm-2
         .col-sm-10
-          = image_tag group_icon(@group.to_param), alt: '', class: 'avatar group-avatar s160'
+          = image_tag group_icon(@group), alt: '', class: 'avatar group-avatar s160'
           %p.light
             - if @group.avatar?
               You can change your group avatar here

app/views/groups/show.html.haml

 .dashboard
   %div
-    = image_tag group_icon(@group.path), class: "avatar group-avatar s90"
+    = image_tag group_icon(@group), class: "avatar group-avatar s90"
     .clearfix
       %h2
         = @group.name

app/views/users/_groups.html.haml

 .clearfix
   - groups.each do |group|
     = link_to group, class: 'profile-groups-avatars inline', title: group.name do
-      = image_tag group_icon(group.path), class: 'avatar group-avatar s40'
+      = image_tag group_icon(group), class: 'avatar group-avatar s40'