Use 'post' prefix for status message route helpers

This is required to make url_for(StatusMessage.new) work

app/models/status_message.rb

@@ -37,6 +37,10 @@ class StatusMessage < Post
     owned_or_visible_by_user(person.owner).joins(:mentions).where(mentions: {person_id: person.id})
   }
 
+  def self.model_name
+    Post.model_name
+  end
+
   def self.guids_for_author(person)
     Post.connection.select_values(Post.where(:author_id => person.id).select('posts.guid').to_sql)
   end

app/views/publisher/_publisher.html.haml

@@ -1,6 +1,6 @@
 .row.publisher#publisher{class: ((aspect == :profile || publisher_open?) ? "mention_popup" : "closed")}
   .content_creation
-    = form_for(StatusMessage.new) do |status|
+    = form_for StatusMessage.new, url: status_messages_path, as: :status_message do |status|
       = status.error_messages
       %params
         .publisher-textarea-wrapper#publisher-textarea-wrapper

app/views/publisher/_publisher.mobile.haml

@@ -2,7 +2,8 @@
 -#   licensed under the Affero General Public License version 3 or later.  See
 -#   the COPYRIGHT file.
 
-= form_for StatusMessage.new, html: {class: "control-group", data: {ajax: false}} do |status|
+= form_for StatusMessage.new, url: status_messages_path, as: :status_message,
+    html: {class: "control-group", data: {ajax: false}} do |status|
   .form-group
     = status.hidden_field :provider_display_name, value: 'mobile'
     = status.text_area :text, placeholder: t('shared.publisher.whats_on_your_mind'), rows: 4, autofocus: "autofocus", class: "form-control"