## mark a section (Learn more)

# decribe_model_attribute(model, attribute, valid_vales = [], invalid_values = []) # {{{ # # Ensures that an instance of class 'model' with the specified attribute is: # -Valid for each of the values in the 'valid_values' array. # -Invalid for each of the values in the 'invalid_values' array. # # Arguments: # -The 'model' arg must be a model class. # -The 'attribute' arg must be a symbol named after an attribute of the specified model class. # -The '*_values' args must be arrays in this format: # [ 'Description', 'value' ] # # An exception is raised if an argument is invalid. # # Example call: # valid_username_values = [ # 'if it has a digit', 'foo4bar', # "if it has a '_'", 'foo_bar', # ] # invalid_username_values = [ # "if it has an '!'", 'foo!bar', # "if it has a ':'", 'f:oobar', # ] # describe_model_attribute User, :username, valid_username_values, invalid_username_values # def describe_model_attribute(model, attribute, valid_values = [], invalid_values = []) raise 'The 1st argument (model) must be a Model class' unless model.is_a? Class raise 'The 2nd argument (attribute) must be a Symbol' unless attribute.is_a? Symbol raise 'The 3rd argument (valid_values) must be an array' unless valid_values.is_a? Array raise 'The 4th argument (invalid_values) must be an array' unless invalid_values.is_a? Array unless valid_values.empty? describe model, "attribute '#{attribute}' should be valid" do # Ensure that each valid value produces a valid instance of 'model' and no error message. valid_values.in_groups_of(2) do |description, value| it description do p = Object.send "build_#{model.to_s.downcase}", {attribute => value} p.save p.should be_valid p.should have(0).error_on(attribute) p.destroy end end end end unless invalid_values.empty? describe model, "attribute '#{attribute}' should be invalid" do # Ensure that each invalid value produces an invalid model and related error message. invalid_values.in_groups_of(2) do |description, value| it description do p = Object.send "build_#{model.to_s.downcase}", {attribute => value} p.save p.should_not be_valid p.should have_at_least(1).error_on(attribute) end end end end end # }}}

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