Refactor: replace "render :json = graph.to_json" to view template(show.json.erb).

Because model shouldn't know about view logic.

app/models/graph/commit.rb

@@ -4,7 +4,7 @@ module Graph
   class Commit
     include ActionView::Helpers::TagHelper
 
-    attr_accessor :time, :spaces, :refs, :parent_spaces, :icon
+    attr_accessor :time, :spaces, :refs, :parent_spaces
 
     def initialize(commit)
       @_commit = commit
@@ -17,26 +17,6 @@ module Graph
       @_commit.send(m, *args, &block)
     end
 
-    def to_graph_hash
-      h = {}
-      h[:parents] = self.parents.collect do |p|
-        [p.id,0,0]
-      end
-      h[:author]  = {
-        name: author.name,
-        email: author.email,
-        icon: icon
-      }
-      h[:time]    = time
-      h[:space]   = spaces.first
-      h[:parent_spaces]   = parent_spaces
-      h[:refs]    = refs.collect{|r|r.name}.join(" ") unless refs.nil?
-      h[:id]      = sha
-      h[:date]    = date
-      h[:message] = message
-      h
-    end
-
     def add_refs(ref_cache, repo)
       if ref_cache.empty?
         repo.refs.each do |ref|

app/models/graph/json_builder.rb

@@ -19,13 +19,6 @@ module Graph
       @days = index_commits
     end
 
-    def to_json(*args)
-      {
-        days: @days.compact.map { |d| [d.day, d.strftime("%b")] },
-        commits: @commits.map(&:to_graph_hash)
-      }.to_json(*args)
-    end
-
   protected
 
     # Get commits from repository