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module Krikri::MappingDSL
##
# Specifies a mapping between a property name and its mapped value(s).
# Deals with static properties (given a specific value or values), and
# dynamic properties (where values are modified by a block).
class PropertyDeclaration
attr_reader :name, :value
def initialize(name, value, _opts = {}, &block)
if block_given?
raise 'Block must have arity of 1 to be applied to property' unless
block.arity == 1
@block = block
end
@name = name
@value = value
end
##
# Returns a proc that can be run to add values for the property to
# Passes value(s) through a block, if given.
#
# If value is a callable object (e.g. a Proc), calls it with the
# OriginalRecord as an argument to determine the value.
#
# @return [Proc] a proc that can be used to generate a value for the named
# property.
def to_proc
block = @block if @block
value = @value
lambda do |target, record|
value = value.call(record) if value.respond_to? :call
return target.send(setter, value) unless block
if value.is_a? Enumerable
values = value.map { |v| instance_exec(v, &block) }
target.send(setter, values)
else
target.send(setter, instance_exec(value, &block))
end
end
end
private
def setter
"#{@name}=".to_sym
end
end
end
Version data entries
47 entries across 47 versions & 1 rubygems