Ability to disable standard fields on a per tracker basis (#1091).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9912 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/tracker.rb

@@ -16,6 +16,10 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 class Tracker < ActiveRecord::Base
+
+  # Other fields should be appended, not inserted!
+  CORE_FIELDS = %w(assigned_to_id category_id fixed_version_id parent_issue_id start_date due_date estimated_hours done_ratio)
+
   before_destroy :check_integrity
   has_many :issues
   has_many :workflows, :dependent => :delete_all do
@@ -28,6 +32,8 @@ class Tracker < ActiveRecord::Base
   has_and_belongs_to_many :custom_fields, :class_name => 'IssueCustomField', :join_table => "#{table_name_prefix}custom_fields_trackers#{table_name_suffix}", :association_foreign_key => 'custom_field_id'
   acts_as_list
 
+  attr_protected :field_bits
+
   validates_presence_of :name
   validates_uniqueness_of :name
   validates_length_of :name, :maximum => 30
@@ -58,6 +64,39 @@ class Tracker < ActiveRecord::Base
     @issue_statuses = IssueStatus.find_all_by_id(ids).sort
   end
 
+  def disabled_core_fields
+    i = -1
+    @disabled_core_fields ||= CORE_FIELDS.select { i += 1; (fields_bits || 0) & (2 ** i) != 0}
+  end
+
+  def core_fields
+    CORE_FIELDS - disabled_core_fields
+  end
+
+  def core_fields=(fields)
+    raise ArgumentError.new("Tracker.core_fields takes an array") unless fields.is_a?(Array)
+
+    bits = 0
+    CORE_FIELDS.each_with_index do |field, i|
+      unless fields.include?(field)
+        bits |= 2 ** i
+      end
+    end
+    self.fields_bits = bits
+    @disabled_core_fields = nil
+    core_fields
+  end
+
+  # Returns the fields that are disabled for all the given trackers
+  def self.disabled_core_fields(trackers)
+    trackers.uniq.map(&:disabled_core_fields).reduce(:&)
+  end
+
+  # Returns the fields that are enabled for one tracker at least
+  def self.core_fields(trackers)
+    trackers.uniq.map(&:core_fields).reduce(:|)
+  end
+
 private
   def check_integrity
     raise Exception.new("Can't delete tracker") if Issue.where(:tracker_id => self.id).any?