Merge pull request #1079 from Ana06/suggest_track_color

Different colors for new tracks, types and levels

app/models/conference.rb

@@ -595,6 +595,20 @@ class Conference < ActiveRecord::Base
     registration_limit > 0 && registrations.count >= registration_limit
   end
 
+  # Returns an hexadecimal color given a collection. The returned color changed
+  # when the number of element in the collection changes and for consecutive
+  # number of elements it returns highly different colors.
+  def next_color_for_collection(collection)
+    # we have different start indices for every collection to generate a
+    # different color for every of them.
+    start_index = {
+      tracks: (program.tracks.count + 1),
+      levels: (program.difficulty_levels.count + 51),
+      types: (program.event_types.count + 101)
+    }
+    next_color(start_index[collection])
+  end
+
   private
 
   # Returns a different html colour for every i and consecutive colors are

app/models/difficulty_level.rb

@@ -3,4 +3,13 @@ class DifficultyLevel < ActiveRecord::Base
   has_many :events, dependent: :nullify
 
   validates :title, presence: true
+  validates :color, format: /\A#[0-9A-F]{6}\z/
+
+  before_validation :capitalize_color
+
+  private
+
+  def capitalize_color
+    self.color = color.upcase if color.present?
+  end
 end

app/models/event.rb

@@ -115,7 +115,7 @@ class Event < ActiveRecord::Base
     json = super(options)
 
     json[:room_guid] = room.try(:guid)
-    json[:track_color] = track.try(:color) || '#ffffff'
+    json[:track_color] = track.try(:color) || '#FFFFFF'
     json[:length] = event_type.try(:length) || 25
 
     json

app/models/event_type.rb

@@ -7,6 +7,9 @@ class EventType < ActiveRecord::Base
   validates :minimum_abstract_length, presence: true
   validates :maximum_abstract_length, presence: true
   validate :length_step
+  validates :color, format: /\A#[0-9A-F]{6}\z/
+
+  before_validation :capitalize_color
 
   alias_attribute :name, :title
 
@@ -21,4 +24,8 @@ class EventType < ActiveRecord::Base
   def length_step
     errors.add(:length, "must be multiple of #{LENGTH_STEP}") if length % LENGTH_STEP != 0
   end
+
+  def capitalize_color
+    self.color = color.upcase if color.present?
+  end
 end

app/models/track.rb

@@ -4,6 +4,9 @@ class Track < ActiveRecord::Base
 
   before_create :generate_guid
   validates :name, presence: true
+  validates :color, format: /\A#[0-9A-F]{6}\z/
+
+  before_validation :capitalize_color
 
   private
 
@@ -14,4 +17,8 @@ class Track < ActiveRecord::Base
 #     end while Person.where(:guid => guid).exists?
     self.guid = guid
   end
+
+  def capitalize_color
+    self.color = color.upcase if color.present?
+  end
 end