FEATURE: add a specific flag reason when a post has been hidden

app/controllers/admin/flags_controller.rb

@@ -23,8 +23,9 @@ class Admin::FlagsController < Admin::AdminController
 
   def agree
     p = Post.find(params[:id])
+    post_action_type = PostAction.post_action_type_for_post(p.id)
     PostAction.defer_flags!(p, current_user.id)
-    PostAction.hide_post!(p)
+    PostAction.hide_post!(p, post_action_type)
     render nothing: true
   end
 
@@ -33,4 +34,5 @@ class Admin::FlagsController < Admin::AdminController
     PostAction.defer_flags!(p, current_user.id)
     render nothing: true
   end
+
 end

app/models/post_action.rb

@@ -77,8 +77,7 @@ class PostAction < ActiveRecord::Base
     actions = PostAction.where(
       defer: nil,
       post_id: post.id,
-      post_action_type_id:
+      post_action_type_id: PostActionType.flag_types.values,
-      PostActionType.flag_types.values,
       deleted_at: nil
     )
 
@@ -284,13 +283,13 @@ class PostAction < ActiveRecord::Base
       old_flags, new_flags = PostAction.flag_counts_for(post.id)
 
       if new_flags >= SiteSetting.flags_required_to_hide_post
-        hide_post!(post, guess_hide_reason(old_flags))
+        hide_post!(post, post_action_type, guess_hide_reason(old_flags))
       end
     end
   end
 
 
-  def self.hide_post!(post, reason=nil)
+  def self.hide_post!(post, post_action_type, reason=nil)
     return if post.hidden
 
     unless reason
@@ -304,10 +303,12 @@ class PostAction < ActiveRecord::Base
 
     # inform user
     if post.user
-      SystemMessage.create(post.user,
+      options = {
-                           :post_hidden,
         url: post.url,
-                           edit_delay: SiteSetting.cooldown_minutes_after_hiding_posts)
+        edit_delay: SiteSetting.cooldown_minutes_after_hiding_posts,
+        flag_reason: I18n.t("flag_reasons.#{post_action_type}"),
+      }
+      SystemMessage.create(post.user, :post_hidden, options)
     end
   end
 
@@ -317,6 +318,11 @@ class PostAction < ActiveRecord::Base
       Post.hidden_reasons[:flag_threshold_reached]
   end
 
+  def self.post_action_type_for_post(post_id)
+    post_action = PostAction.where(defer: nil, post_id: post_id, post_action_type_id: PostActionType.flag_types.values, deleted_at: nil).first
+    PostActionType.types[post_action.post_action_type_id]
+  end
+
   protected
 
   def self.target_moderators

config/locales/server.en.yml

@@ -1092,6 +1092,11 @@ en:
       one: "1 flag is waiting to be handled"
       other: "%{count} flags are waiting to be handled"
 
+  flag_reasons:
+    off_topic: "Your post was flagged as **off-topic**: the community thinks it does not fit into the topic, as currently defined by the title and the first post."
+    inappropriate: "Your post was flagged as **inappropriate**: the community thinks it is offensive, abusive, or a violation of [the community guidelines](/faq)."
+    spam: "Your post was flagged as **spam**: the community thinks it is an advertisement, not useful or relevant to the topic, but promotional in nature."
+
   system_messages:
     post_hidden:
       subject_template: "Post hidden due to community flagging"
@@ -1104,6 +1109,8 @@ en:
 
         ... was hidden due to community flagging.
 
+        %{flag_reason}
+
         Keep in mind that multiple community members flagged this post before it was hidden, so **please consider how you might revise your post to reflect their feedback.** You can edit your post after %{edit_delay} minutes, and it will be automatically unhidden. This will increase your trust level.
 
         However, if the post is hidden by the community a second time, the moderators will be notified -- and there may be further action, including the possible suspension of your account.

spec/models/post_action_spec.rb

@@ -95,7 +95,7 @@ describe PostAction do
       post.reload
       post.hidden.should be_false
 
-      PostAction.hide_post!(post)
+      PostAction.hide_post!(post, PostActionType.types[:off_topic])
       post.reload
       post.hidden.should be_true
     end