Module: Lab42::DataClass

Defined in:
lib/lab42/data_class.rb,
lib/lab42/data_class/proxy.rb,
lib/lab42/data_class/version.rb,
lib/lab42/data_class/proxy/memos.rb,
lib/lab42/data_class/proxy/mixin.rb,
lib/lab42/data_class/proxy/derived.rb,
lib/lab42/data_class/constraint_error.rb,
lib/lab42/data_class/validation_error.rb,
lib/lab42/data_class/proxy/constraints.rb,
lib/lab42/data_class/proxy/validations.rb,
lib/lab42/data_class/proxy/constraints/maker.rb,
lib/lab42/data_class/duplicate_definition_error.rb

Defined Under Namespace

Classes: ConstraintError, DuplicateDefinitionError, Proxy, ValidationError

Constant Summary collapse

VERSION = 
"0.7.0"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(extendee) ⇒ Object 



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# File 'lib/lab42/data_class.rb', line 13

def self.extended(extendee)
  base_proxy =
    extendee
    .ancestors
    .grep(self)
    .drop(1)
    .first
      &.__data_class_proxy__

  proxy = base_proxy ? Proxy.from_parent(base_proxy, extendee) : Proxy.new(extendee)

  extendee.module_eval do
    define_singleton_method(:__data_class_proxy__){ proxy }
  end
end

Instance Method Details

#attributes(*args, **kwds) ⇒ Object 



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# File 'lib/lab42/data_class.rb', line 29

def attributes(*args, **kwds)
  __data_class_proxy__.tap do |proxy|
    proxy.update!(args, kwds)
    proxy.define_class!
  end
end

#constraint(member, constraint = nil, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/lab42/data_class.rb', line 41

def constraint(member, constraint = nil, &block)
  raise ArgumentError, "must not provide constraint (2nd argument) and a block" if block && constraint

  __data_class_proxy__.define_constraints(member => constraint || block)
  __data_class_proxy__.define_class!
end

#derive(att_name, &blk) ⇒ Object 



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# File 'lib/lab42/data_class.rb', line 36

def derive(att_name, &blk)
  __data_class_proxy__.define_derived_attribute(att_name, &blk)
  __data_class_proxy__.define_class!
end