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module Swift
# An attribute (column) definition.
#--
# NOTE: Default method is defined in the extension.
class Attribute
attr_reader :name, :field, :key, :serial
# @example
# user = Class.new(Swift::Record)
# Swift::Attribute.new(user, :name, Swift::Type::String)
#
# @param [Swift::Record] record
# @param [Symbol] name
# @param [Hash] options
# @option options [Object, Proc] :default
# @option options [Symbol] :field
# @option options [TrueClass, FalseClass] :key
# @option options [TrueClass, FalseClass] :serial
#
# @see Swift::Record
# @see Swift::Type
def initialize record, name, options = {}
@name = name
@default = options.fetch(:default, nil)
@field = options.fetch(:field, name)
@key = options.fetch(:key, false)
@serial = options.fetch(:serial, false)
define_record_methods(record)
end
def default
case @default
when Numeric, Symbol, true, false, nil
@default
when Proc
@default.call
else
@default.dup
end
end
# The attributes field.
#
# @return [String]
def to_s
field.to_s
end
# Evals attribute accessors for this attribute into the record.
def define_record_methods record
record.class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{name}; tuple.fetch(:#{field}, nil) end
def #{name}= value; tuple.store(:#{field}, value) end
RUBY
end
end # Attribute
end # Swift
Version data entries
6 entries across 6 versions & 1 rubygems