refactor json_rendering

app/helpers/json_rendering.rb

@@ -12,6 +12,16 @@ def initialize(json, options = {})
     @route_prefix += '_' unless @route_prefix.end_with?('_') || @route_prefix.blank?
   end
 
+  %i[rep_url state_url district_url office_location_url].each do |method_name|
+    define_method(method_name) do |id|
+      if route_prefix.blank?
+        super(id)
+      else
+        send("#{route_prefix}#{method_name}", id)
+      end
+    end
+  end
+
   def response(symbol, object)
     send(symbol, object)
   end
@@ -29,29 +39,37 @@ def office_locations(office_locations)
   end
 
   def rep(rep)
-    return json.error 'Record not found' if rep.blank?
-    json.self send("#{route_prefix}rep_url", rep.official_id)
-    json.state { state rep.state }
-    json.district { district rep.district } if rep.district
+    return not_found if rep.blank?
+    json.self rep_url(rep.official_id)
+    state_and_district_for_rep(rep)
     _rep rep
     json.set! 'office_locations', rep.active_office_locations do |office_location|
       self.office_location office_location
     end
   end
 
+  def state_and_district_for_rep(rep)
+    json.state { state rep.state }
+    json.district { district rep.district } if rep.district
+  end
+
+  def not_found
+    json.error 'Record not found'
+  end
+
   def state(state)
-    json.self send("#{route_prefix}state_url", state.state_code)
+    json.self state_url(state.state_code)
     json.extract! state, :state_code, :name, :abbr
   end
 
   def district(district)
-    json.self send("#{route_prefix}district_url", district.full_code)
+    json.self district_url(district.full_code)
     json.extract! district, :full_code, :code, :state_code, :level, :chamber, :name
   end
 
   def office_location(office_location)
-    json.self send("#{route_prefix}office_location_url", office_location.office_id)
-    json.rep send("#{route_prefix}rep_url", office_location.official_id)
+    json.self office_location_url(office_location.office_id)
+    json.rep rep_url(office_location.official_id)
     json.extract! office_location, :active, :official_id, :level, :office_id,
                   :bioguide_id, :state_leg_id, :office_type, :distance, :building,
                   :address, :suite, :city, :state, :zip, :phone, :fax, :hours,