Sha256: ccd880352dc7b3d2babb5eb4889375790168c2b3186d7ae3779bd8b5fbb9a957
Contents?: true
Size: 1.36 KB
Versions: 37
Compression:
Stored size: 1.36 KB
Contents
module Bmg
module Relation
#
# This module can be used to create typed collection on top
# of Bmg relations. Algebra methods will be delegated to the
# decorated relation, and results wrapped in a new instance
# of the class.
#
module Proxy
def initialize(relation)
@relation = relation
end
def method_missing(name, *args, &bl)
if @relation.respond_to?(name)
res = @relation.send(name, *args, &bl)
res.is_a?(Relation) ? _proxy(res) : res
else
super
end
end
def respond_to?(name, *args)
@relation.respond_to?(name) || super
end
[
:extend
].each do |name|
define_method(name) do |*args, &bl|
res = @relation.send(name, *args, &bl)
res.is_a?(Relation) ? _proxy(res) : res
end
end
[
:one,
:one_or_nil
].each do |meth|
define_method(meth) do |*args, &bl|
res = @relation.send(meth, *args, &bl)
res.nil? ? nil : _proxy_tuple(res)
end
end
def to_json(*args, &bl)
@relation.to_json(*args, &bl)
end
protected
def _proxy(relation)
self.class.new(relation)
end
def _proxy_tuple(tuple)
tuple
end
end # module Proxy
end # class Relation
end # module Bmg
Version data entries
37 entries across 37 versions & 1 rubygems