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# Copyright (c) 2008-2012 Phusion
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
module DefaultValueFor
class NormalValueContainer
def initialize(value)
@value = value
end
def evaluate(instance)
if @value.duplicable?
return @value.dup
else
return @value
end
end
end
class BlockValueContainer
def initialize(block)
@block = block
end
def evaluate(instance)
if @block.arity == 0
return @block.call
else
return @block.call(instance)
end
end
end
module ClassMethods
# Declares a default value for the given attribute.
#
# Sets the default value to the given options parameter unless the given options equal { :value => ... }
#
# The <tt>options</tt> can be used to specify the following things:
# * <tt>value</tt> - Sets the default value.
# * <tt>allows_nil (default: true)</tt> - Sets explicitly passed nil values if option is set to true.
def default_value_for(attribute, options = {}, &block)
value = options
allows_nil = true
if options.is_a?(Hash)
opts = options.stringify_keys
value = opts.fetch('value', options)
allows_nil = opts.fetch('allows_nil', true)
end
if !method_defined?(:set_default_values)
include(InstanceMethods)
after_initialize :set_default_values
class_attribute :_default_attribute_values
class_attribute :_default_attribute_values_not_allowing_nil
extend(DelayedClassMethods)
init_hash = true
else
init_hash = !singleton_methods(false).include?(:_default_attribute_values)
end
if init_hash
self._default_attribute_values = {}
self._default_attribute_values_not_allowing_nil = []
end
if block_given?
container = BlockValueContainer.new(block)
else
container = NormalValueContainer.new(value)
end
_default_attribute_values[attribute.to_s] = container
_default_attribute_values_not_allowing_nil << attribute.to_s unless allows_nil
end
def default_values(values)
values.each_pair do |key, options|
options = options.stringify_keys if options.is_a?(Hash)
value = options.is_a?(Hash) && options.has_key?('value') ? options['value'] : options
if value.kind_of? Proc
default_value_for(key, options.is_a?(Hash) ? options : {}, &value)
else
default_value_for(key, options)
end
end
end
end
module DelayedClassMethods
def _all_default_attribute_values
return _default_attribute_values unless superclass.respond_to?(:_default_attribute_values)
superclass._all_default_attribute_values.merge(_default_attribute_values)
end
def _all_default_attribute_values_not_allowing_nil
return _default_attribute_values_not_allowing_nil unless superclass.respond_to?(:_default_attribute_values_not_allowing_nil)
result = superclass._all_default_attribute_values_not_allowing_nil + _default_attribute_values_not_allowing_nil
result.uniq!
result
end
end
module InstanceMethods
def initialize(attributes = nil, options = {})
attributes = attributes.to_h if attributes.respond_to?(:to_h)
@initialization_attributes = attributes.is_a?(Hash) ? attributes.stringify_keys : {}
unless options[:without_protection]
if respond_to?(:mass_assignment_options, true) && options.has_key?(:as)
@initialization_attributes = sanitize_for_mass_assignment(@initialization_attributes, options[:as])
elsif respond_to?(:sanitize_for_mass_assignment, true)
@initialization_attributes = sanitize_for_mass_assignment(@initialization_attributes)
else
@initialization_attributes = remove_attributes_protected_from_mass_assignment(@initialization_attributes)
end
end
if self.class.respond_to? :protected_attributes
super(attributes, options)
else
super(attributes)
end
end
def attributes_for_create(attribute_names)
attribute_names += self.class._all_default_attribute_values.keys.map(&:to_s).find_all { |name|
self.class.columns_hash.key?(name)
}
super
end
def set_default_values
self.class._all_default_attribute_values.each do |attribute, container|
next unless new_record? || self.class._all_default_attribute_values_not_allowing_nil.include?(attribute)
connection_default_value_defined = new_record? && respond_to?("#{attribute}_changed?") && !__send__("#{attribute}_changed?")
attribute_blank = if attributes.has_key?(attribute)
column = self.class.columns_hash[attribute]
if column && column.type == :boolean
attributes[attribute].nil?
else
attributes[attribute].blank?
end
elsif respond_to?(attribute)
send(attribute).nil?
else
instance_variable_get("@#{attribute}").nil?
end
next unless connection_default_value_defined || attribute_blank
# allow explicitly setting nil through allow nil option
next if @initialization_attributes.is_a?(Hash) &&
(
@initialization_attributes.has_key?(attribute) ||
(
@initialization_attributes.has_key?("#{attribute}_attributes") &&
nested_attributes_options.stringify_keys[attribute]
)
) &&
!self.class._all_default_attribute_values_not_allowing_nil.include?(attribute)
__send__("#{attribute}=", container.evaluate(self))
if respond_to?(:clear_attribute_changes, true)
clear_attribute_changes [attribute] if has_attribute?(attribute)
else
changed_attributes.delete(attribute)
end
end
end
end
end
if defined?(Rails::Railtie)
require 'default_value_for/railtie'
else
# For anybody is using AS and AR without Railties, i.e. Padrino.
ActiveRecord::Base.extend(DefaultValueFor::ClassMethods)
end
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