Class: Micro::Attributes::Diff::Changes

Inherits:
Object
  • Object
show all
Defined in:
lib/micro/attributes/diff.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(from:, to:) ⇒ Changes

Returns a new instance of Changes.



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# File 'lib/micro/attributes/diff.rb', line 12

def initialize(from:, to:)
  @from_class = from.class

  @from, @to = from, Kind::Of.(@from_class, to)

  @from_key, @to_key =
    @from_class.attributes_access == :symbol ? FROM_TO_SYM : FROM_TO_STR

  @differences = diff(from.attributes, to.attributes).freeze
end

Instance Attribute Details

#differences ⇒ Object (readonly)

Returns the value of attribute differences.



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# File 'lib/micro/attributes/diff.rb', line 10

def differences
  @differences
end

#from ⇒ Object (readonly)

Returns the value of attribute from.



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# File 'lib/micro/attributes/diff.rb', line 10

def from
  @from
end

#to ⇒ Object (readonly)

Returns the value of attribute to.



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# File 'lib/micro/attributes/diff.rb', line 10

def to
  @to
end

Instance Method Details

#changed?(name = nil, from: nil, to: nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/micro/attributes/diff.rb', line 32

def changed?(name = nil, from: nil, to: nil)
  if name.nil?
    return present? if from.nil? && to.nil?

    raise ArgumentError, FROM_TO_ERROR
  elsif from.nil? && to.nil?
    differences.has_key?(key_transform(name))
  else
    result = @differences[key_transform(name)]
    result ? result[@from_key] == from && result[@to_key] == to : false
  end
end

#empty? ⇒ Boolean Also known as: blank?

Returns:

  • (Boolean) 


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# File 'lib/micro/attributes/diff.rb', line 23

def empty?
  @differences.empty?
end

#present? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/micro/attributes/diff.rb', line 28

def present?
  !empty?
end