Module: Spacer::Model::ClassMethods

Defined in:
lib/spacer/model.rb

Instance Method Summary collapse

Instance Method Details

#from_hash(hash) {|instance| ... } ⇒ Object

Instantiate a new instance of the class into which we are included and populate that instance’s attributes given the provided Hash. Key names in the Hash should map to attribute names on the model.

Yields:

  • (instance) 


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# File 'lib/spacer/model.rb', line 37

def from_hash(hash)
  instance = new(hash)
  yield instance if block_given?
  instance
end

#hash_settable_accessor(symbol, klass) ⇒ Object

Declares an attribute named ::symbol
which can be set with either an instance of ::klass

or a Hash which will be used to populate a new instance of ::klass::.



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# File 'lib/spacer/model.rb', line 74

def hash_settable_accessor(symbol, klass)
  attr_reader symbol
  hash_settable_writer(symbol, klass)
end

#hash_settable_list_accessor(symbol, klass) ⇒ Object

Declares an attribute named ::symbol
which can be set with either a list of instances of ::klass

or a list of Hashes which will be used to populate a new instance of ::klass::.



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# File 'lib/spacer/model.rb', line 88

def hash_settable_list_accessor(symbol, klass)
  attr_reader symbol
  hash_settable_list_writer(symbol, klass)
end

#hash_settable_list_writer(symbol, klass) ⇒ Object 



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# File 'lib/spacer/model.rb', line 93

def hash_settable_list_writer(symbol, klass)
  define_method("#{symbol}=") do |list|
    instance_variable_set("@#{symbol}", list.map do |item|
      item.kind_of?(Hash) ? klass.from_hash(item) : item
    end)
  end
end

#hash_settable_writer(symbol, klass) ⇒ Object 



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# File 'lib/spacer/model.rb', line 79

def hash_settable_writer(symbol, klass)
  define_method("#{symbol}=") do |value|
    instance_variable_set("@#{symbol}", value.kind_of?(Hash) ? klass.from_hash(value) : value)
  end        
end

#populating_attr_accessor(*symbols) ⇒ Object

Create a standard attr_writer and a populating_attr_reader



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# File 'lib/spacer/model.rb', line 45

def populating_attr_accessor(*symbols)
  attr_writer *symbols
  populating_attr_reader *symbols
end

#populating_attr_reader(*symbols) ⇒ Object

Create a reader that will attempt to populate the model if it has not already been populated



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# File 'lib/spacer/model.rb', line 52

def populating_attr_reader(*symbols)
  symbols.each do |symbol|
    define_method(symbol) do
      populate unless populated?
      instance_variable_get("@#{symbol}")
    end
  end
end

#populating_hash_settable_accessor(symbol, klass) ⇒ Object 



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# File 'lib/spacer/model.rb', line 61

def populating_hash_settable_accessor(symbol, klass)
  populating_attr_reader symbol
  hash_settable_writer(symbol, klass)
end

#populating_hash_settable_list_accessor(symbol, klass) ⇒ Object 



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# File 'lib/spacer/model.rb', line 66

def populating_hash_settable_list_accessor(symbol, klass)
  populating_attr_reader symbol
  hash_settable_list_writer(symbol, klass)
end