Sha256: cc1d6137e330a436268f4f9f4895ef1b956b95c18a8b04bdf4d9b043f6e9a99c
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Size: 1.33 KB
Versions: 8
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Stored size: 1.33 KB
Contents
module Reform
# Keeps composition of models and knows how to transform a plain hash into a nested hash.
class Composition
class << self
def map(options)
@attr2obj = {} # {song: ["title", "track"], artist: ["name"]}
options.each do |mdl, meths|
create_accessors(mdl, meths)
attr_reader mdl
meths.each { |m| @attr2obj[m.to_s] = mdl }
end
end
# Specific to representable.
def map_from(representer)
options = {}
representer.representable_attrs.each do |cfg|
options[cfg.options[:on]] ||= []
options[cfg.options[:on]] << cfg.name
end
map options
end
def model_for_property(name)
@attr2obj.fetch(name.to_s)
end
private
def create_accessors(model, methods)
accessors = methods.collect { |m| [m, "#{m}="] }.flatten
delegate *accessors << {:to => :"#{model}"}
end
end
# TODO: make class method?
def nested_hash_for(attrs)
{}.tap do |hsh|
attrs.each do |name, val|
obj = self.class.model_for_property(name)
hsh[obj] ||= {}
hsh[obj][name.to_sym] = val
end
end
end
def initialize(models)
models.each do |name, obj|
instance_variable_set(:"@#{name}", obj)
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems