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Contents
module Sunspot
#
# DataExtractors present an internal API for the indexer to use to extract
# field values from models for indexing. They must implement the #value_for
# method, which takes an object and returns the value extracted from it.
#
module DataExtractor #:nodoc: all
#
# AttributeExtractors extract data by simply calling a method on the block.
#
class AttributeExtractor
def initialize(attribute_name)
@attribute_name = attribute_name
end
def value_for(object)
object.send(@attribute_name)
end
end
#
# BlockExtractors extract data by evaluating a block in the context of the
# object instance, or if the block takes an argument, by passing the object
# as the argument to the block. Either way, the return value of the block is
# the value returned by the extractor.
#
class BlockExtractor
def initialize(&block)
@block = block
end
def value_for(object)
Util.instance_eval_or_call(object, &@block)
end
end
#
# Constant data extractors simply return the same value for every object.
#
class Constant
def initialize(value)
@value = value
end
def value_for(object)
@value
end
end
end
end
Version data entries
78 entries across 78 versions & 15 rubygems