Set @Options in assing_ref_vars

@Options enable to keep params when switching ref.

app/controllers/graph_controller.rb

@@ -8,14 +8,8 @@ class GraphController < ProjectResourceController
   before_filter :require_non_empty_project
   def show
-    if params.has_key?(:q)
-      if params[:q].blank?
-        redirect_to project_graph_path(@project, params[:id])
-        return
-      end
-
-      @q = params[:q]
-      @commit = @project.repository.commit(@q) || @commit
+    if @options[:q]
+      @commit = @project.repository.commit(@options[:q]) || @commit
     end
     respond_to do |format|

app/controllers/refs_controller.rb

@@ -14,7 +14,7 @@ class RefsController < ProjectResourceController
                    elsif params[:destination] == "blob"
                      project_blob_path(@project, (@id))
                    elsif params[:destination] == "graph"
-                     project_graph_path(@project, @id)
+                     project_graph_path(@project, @id, @options)
                    else
                      project_commits_path(@project, @id)
                    end

app/views/graph/_head.html.haml

@@ -10,7 +10,9 @@
       .control-group
         = label_tag :search , "Looking for commit:", class: 'control-label light'
         .controls
-          = text_field_tag :q, @q, placeholder: "Input SHA", class: "search-input xlarge"
+          = text_field_tag :q, @options[:q], placeholder: "Input SHA", class: "search-input xlarge"
           = button_tag type: 'submit', class: 'btn vtop' do
             %i.icon-search
+          - @options.each do |key, value|
+            = hidden_field_tag(key, value, id: nil) unless key == "q"

app/views/graph/show.html.haml

@@ -7,9 +7,8 @@
 :javascript
   var branch_graph;
-
   branch_graph = new BranchGraph($("#holder"), {
-    url: '#{project_graph_path(@project, @ref, q: @q, format: :json)}',
+    url: '#{project_graph_path(@project, @ref, @options.merge(format: :json))}',
     commit_url: '#{project_commit_path(@project, 'ae45ca32').gsub("ae45ca32", "%s")}',
     ref: '#{@ref}',
     commit_id: '#{@commit.id}'

app/views/shared/_ref_switcher.html.haml

@@ -3,3 +3,5 @@
   = hidden_field_tag :destination, destination
   - if defined?(path)
     = hidden_field_tag :path, path
+  - @options && @options.each do |key, value|
+    = hidden_field_tag key, value, id: nil

lib/extracts_path.rb

@@ -106,6 +106,11 @@ module ExtractsPath
     @hex_path = Digest::SHA1.hexdigest(@path)
     @logs_path = logs_file_project_ref_path(@project, @ref, @path)
+    # assign allowed options
+    allowed_options = ["filter_ref", "q"]
+    @options = params.select {|key, value| allowed_options.include?(key) && !value.blank? }
+    @options = HashWithIndifferentAccess.new(@options)
+
     raise InvalidPathError unless @tree.exists?
   rescue RuntimeError, NoMethodError, InvalidPathError
     not_found!