[#2281] Added TimeEntryActivity#billable? query method which will lookup

the settings and the current custom values of the TimeEntryActivity.

lib/overhead_time_entry_activity_patch.rb

@@ -0,0 +1,42 @@
+require_dependency 'time_entry_activity'
+
+module OverheadTimeEntryActivityPatch
+  def self.included(base)
+    base.extend(ClassMethods)
+
+    base.send(:include, InstanceMethods)
+
+    base.class_eval do
+      unloadable
+    end
+
+  end
+  
+  module ClassMethods
+    
+  end
+  
+  module InstanceMethods
+    # Is the Activity Billable, based on it's custom data?
+    def billable?
+      if Setting['plugin_redmine_overhead'] && Setting['plugin_redmine_overhead']['custom_field']
+        billable_field = TimeEntryActivityCustomField.find_by_id(Setting['plugin_redmine_overhead']['custom_field'])
+
+        if billable_field && field = self.custom_value_for(billable_field)
+          if billable_field.field_format == 'bool'
+            setting = (Setting['plugin_redmine_overhead']['billable_value'] == "true") ? true : false
+            activity_field = (field.value == "1") ? true : false
+            return activity_field == setting
+          else
+            return field.value == Setting['plugin_redmine_overhead']['billable_value']
+          end
+        else
+          return false
+        end
+      else
+        return false
+      end
+    end
+  end    
+end
+