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# Represents a preferred value for a particular preference on a model.
#
# == Targeted preferences
#
# In addition to simple named preferences, preferences can also be targeted for
# a particular record. For example, a User may have a preferred color for a
# particular Car. In this case, the +owner+ is the User, the +preference+ is
# the color, and the +target+ is the Car. This allows preferences to have a sort
# of context around them.
class Preference < ActiveRecord::Base
belongs_to :owner, :polymorphic => true
belongs_to :group, :polymorphic => true
validates_presence_of :attribute, :owner_id, :owner_type
validates_presence_of :group_type, :if => :group_id?
class << self
# Splits the given group into its corresponding id and type
def split_group(group = nil)
if group.is_a?(ActiveRecord::Base)
group_id, group_type = group.id, group.class.base_class.name.to_s
else
group_id, group_type = nil, group
end
return group_id, group_type
end
end
# The definition for the attribute
def definition
owner.preference_definitions[attribute] unless owner_type.blank?
end
# Typecasts the value depending on the preference definition's declared type
def value
value = read_attribute(:value)
value = definition.type_cast(value) if definition
value
end
# Only searches for the group record if the group id is specified
def group_with_optional_lookup
group_id ? group_without_optional_lookup : group_type
end
alias_method_chain :group, :optional_lookup
end
# Most of this code is taken from the preferences plugin available
# at http://github.com/pluginaweek/preferences/tree/master
Version data entries
29 entries across 29 versions & 3 rubygems