Fix edit files since we use Gitlab::Git::Blob for files

app/controllers/edit_tree_controller.rb

@@ -22,7 +22,7 @@ class EditTreeController < ProjectResourceController
     )
 
     if updated_successfully
-      redirect_to project_tree_path(@project, @id), notice: "Your changes have been successfully commited"
+      redirect_to project_blob_path(@project, @id), notice: "Your changes have been successfully commited"
     else
       flash[:notice] = "Your changes could not be commited, because the file has been changed"
       render :edit
@@ -32,8 +32,10 @@ class EditTreeController < ProjectResourceController
   private
 
   def edit_requirements
-    unless @tree.is_blob? && @tree.text?
-      redirect_to project_tree_path(@project, @id), notice: "You can only edit text files"
+    @blob = Gitlab::Git::Blob.new(@repository, @commit.id, @ref, @path)
+
+    unless @blob.exists? && @blob.text?
+      redirect_to project_blob_path(@project, @id), notice: "You can only edit text files"
     end
 
     allowed = if project.protected_branch? @ref

app/views/edit_tree/show.html.haml

@@ -4,21 +4,21 @@
       .file_title
         %i.icon-file
         %span.file_name
-          = @tree.path
+          = @path
           %small
             on
             %strong= @ref
         %span.options
           .btn-group.tree-btn-group
-            = link_to "Cancel", project_tree_path(@project, @id), class: "btn btn-tiny btn-cancel", confirm: "Are you sure?"
+            = link_to "Cancel", project_blob_path(@project, @id), class: "btn btn-tiny btn-cancel", confirm: "Are you sure?"
       .file_content.code
-        %pre#editor= @tree.data
+        %pre#editor= @blob.data
 
     .control-group.commit_message-group
       = label_tag 'commit_message', class: "control-label" do
         Commit message
       .controls
-        = text_area_tag 'commit_message', '', placeholder: "Update #{@tree.name}", required: true, rows: 3
+        = text_area_tag 'commit_message', '', placeholder: "Update #{@blob.name}", required: true, rows: 3
     .form-actions
       = hidden_field_tag 'last_commit', @last_commit
       = hidden_field_tag 'content', '', id: :file_content
@@ -30,7 +30,7 @@
       = link_to "Cancel", project_tree_path(@project, @id), class: "btn btn-cancel", confirm: "Are you sure?"
 
 :javascript
-  var ace_mode = "#{@tree.language.try(:ace_mode)}";
+  var ace_mode = "#{@blob.language.try(:ace_mode)}";
   var editor = ace.edit("editor");
   if (ace_mode) {
     editor.getSession().setMode('ace/mode/' + ace_mode);