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module Selections
module BelongsToSelection
# Helper for belongs_to and accepts all the standard rails options
#
# Example
# class Thing < ActiveRecord::Base
# belongs_to_selection :priority
#
# by default adds - class_name: "Selection"
#
# This macro also adds a number of methods onto the class if there is a selection
# named as the class underscore name (eg: "thing_priority"), then methods are created
# for all of the selection values under that parent. For example:
#
# thing = Thing.find(x)
# thing.priority = Selection.thing_priority_high
# thing.priority_high? #=> true
# thing.priority_low? #=> false
#
# thing.priority_high? is equivalent to thing.priority == Selection.thing_priority_high
# except that the id of the selection is cached at the time the class is loaded.
#
# Note that this is only appropriate to use for system selection values that are known
# at development time, and not to values that the users can edit in the live system.
def belongs_to_selection(target, options={})
belongs_to target, options.merge(:class_name => "Selection")
# The "selections" table may not exist during certain rake scenarios such as db:migrate or db:reset.
if ActiveRecord::Base.connection.table_exists? Selection.table_name
prefix = self.name.downcase
parent = Selection.where(system_code: "#{prefix}_#{target}").first
if parent
target_id = "#{target}_id".to_sym
parent.children.each do |s|
method_name = "#{s.system_code.sub("#{prefix}_", '')}?".to_sym
class_eval do
define_method method_name do
send(target_id) == s.id
end
end
end
end
end
end
ActiveSupport.on_load :active_record do
extend Selections::BelongsToSelection
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems