Class: Model

Inherits:
Object
  • Object
show all
Defined in:
lib/model.rb,
lib/model/version.rb

Constant Summary collapse

VERSION = 
"0.1.1"

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash = {}) ⇒ Model

Returns a new instance of Model.



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# File 'lib/model.rb', line 30

def initialize(hash={})
  unknown = hash.keys - keys
  if unknown.count > 0
    raise ArgumentError, "unknown keyword#{'s' if unknown.count > 1}: #{unknown.join', '}"
  end
  hash.each_pair {|key, v| instance_variable_set "@#{key}", v}
  (self.class.defaults.keys - hash.keys).each do |key|
    block = self.class.defaults[key]
    instance_variable_set("@#{key}", instance_exec(&block))
  end
end

Class Attribute Details

.defaults ⇒ Object 



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# File 'lib/model.rb', line 13

def defaults
  @defaults ||= {}
end

.keys ⇒ Object 



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# File 'lib/model.rb', line 9

def keys
  @keys ||= []
end

Class Method Details

.inherited(subclass) ⇒ Object 



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# File 'lib/model.rb', line 17

def inherited(subclass)
  subclass.keys = keys.dup
  subclass.defaults = defaults.dup
end

.key(symbol, &block) ⇒ Object

define a key and an optional block that provides a default value for the key



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# File 'lib/model.rb', line 23

def key(symbol, &block)
  keys << symbol unless @keys.include? symbol
  attr_accessor symbol
  defaults[symbol] = block if block
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/model.rb', line 46

def [] key
  send key
end

#keys ⇒ Object 



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# File 'lib/model.rb', line 42

def keys
  self.class.keys
end