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# File 'lib/tarte/baked_in_associations.rb', line 91
def has_many_baked_in(association_name, methods = nil)
names_constant = association_name.to_s.upcase
methods[:verb] ||= :has
write_inheritable_hash(:has_many_baked_in_attributes, association_name => methods[:verb])
class_eval <<-EOV
#{names_constant} = #{methods[:names].inspect}
def #{association_name}=(values)
return nil unless values
if values.class == Array
new_mask = (values & #{names_constant}).map { |v| 2**#{names_constant}.index(v) }.sum
else values
new_mask = #{names_constant}_GROUPS_MASKS[values]
end
raise(Tarte::Errors::NotValidAssociationMask) if new_mask >= #{2**methods[:names].size}
self.#{association_name}_mask = new_mask
end
def #{association_name}
#{names_constant}.reject { |v| ((self.#{association_name}_mask || 0) & 2**#{names_constant}.index(v)).zero? }
end
def #{association_name}_were
#{names_constant}.reject { |v| ((self.#{association_name}_mask_was || 0) & 2**#{names_constant}.index(v)).zero? }
end
def #{association_name}_changed?
self.#{association_name}_mask_changed?
end
def self.#{association_name}_mask_for(names)
if names.class == Array
new_mask = (names & #{names_constant}).map { |v| 2**#{names_constant}.index(v.to_sym) }.sum
raise(Tarte::Errors::NotValidAssociationMask) if new_mask >= #{2**methods[:names].size}
new_mask
else
#{names_constant}_GROUPS_MASKS[names]
end
end
EOV
methods[:names].each_with_index do |value, index|
class_eval <<-EOV
def #{methods[:verb]}_#{value}?
self.#{association_name}_mask & #{2**index} > 0
end
EOV
end
if methods[:groups]
hash_with_masks = methods[:groups].merge(methods[:groups]) do |group, member_names|
(member_names & methods[:names]).map { |m| 2**methods[:names].index(m.to_sym) }.sum
end
class_eval <<-EOV
#{names_constant}_GROUPS_MASKS = #{hash_with_masks.inspect}
# Use this method to build scopes
def self.#{association_name}_condition(condition)
{:#{association_name}_mask => #{names_constant}_GROUPS_MASKS[condition]}
end
def #{association_name}_matches(group)
self.#{association_name}_mask == #{names_constant}_GROUPS_MASKS[group]
end
EOV
methods[:groups].each_key do |group|
send(:named_scope, "matching_#{group}", :conditions => {"#{association_name}_mask".to_sym => hash_with_masks[group]})
send(:named_scope, "with_#{group}", :conditions => ["#{association_name}_mask & ? > 0", hash_with_masks[group]])
class_eval <<-EOV
def #{association_name}_matches_#{group}?
self.#{association_name}_mask == #{names_constant}_GROUPS_MASKS[:#{group}]
end
EOV
end
end
end
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