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Contents
module ActiveFedora
module Delegating
extend ActiveSupport::Concern
module ClassMethods
# Provides a delegate class method to expose methods in metadata streams
# as member of the base object. Pass the target datastream via the
# <tt>:to</tt> argument. If you want to return a unique result, (e.g. string
# instead of an array) set the <tt>:unique</tt> argument to true.
#
# class Foo < ActiveFedora::Base
# has_metadata :name => "descMetadata", :type => MyDatastream
#
# delegate :field1, :to=>"descMetadata", :unique=>true
# end
#
# foo = Foo.new
# foo.field1 = "My Value"
# foo.field1 # => "My Value"
# foo.field2 # => NoMethodError: undefined method `field2' for #<Foo:0x1af30c>
def delegate(field, args ={})
create_delegate_accessor(field, args)
create_delegate_setter(field, args)
end
private
def create_delegate_accessor(field, args)
define_method field do
ds = self.send(args[:to])
val = if ds.kind_of? ActiveFedora::NokogiriDatastream
ds.send(:term_values, field)
else
ds.send(:get_values, field)
end
args[:unique] ? val.first : val
end
end
def create_delegate_setter(field, args)
define_method "#{field}=".to_sym do |v|
ds = self.send(args[:to])
if ds.kind_of? ActiveFedora::NokogiriDatastream
ds.send(:update_indexed_attributes, {[field] => v})
else
ds.send(:set_value, field, v)
end
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems