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module ActiveRecord
# = Active Record Dynamic Finder Match
#
# Refer to ActiveRecord::Base documentation for Dynamic attribute-based finders for detailed info
#
class DynamicFinderMatch
def self.match(method)
finder = :first
bang = false
instantiator = nil
case method.to_s
when /^find_(all_|last_)?by_([_a-zA-Z]\w*)$/
finder = :last if $1 == 'last_'
finder = :all if $1 == 'all_'
names = $2
when /^find_by_([_a-zA-Z]\w*)\!$/
bang = true
names = $1
when /^find_or_create_by_([_a-zA-Z]\w*)\!$/
bang = true
instantiator = :create
names = $1
when /^find_or_(initialize|create)_by_([_a-zA-Z]\w*)$/
instantiator = $1 == 'initialize' ? :new : :create
names = $2
else
return nil
end
new(finder, instantiator, bang, names.split('_and_'))
end
def initialize(finder, instantiator, bang, attribute_names)
@finder = finder
@instantiator = instantiator
@bang = bang
@attribute_names = attribute_names
end
attr_reader :finder, :attribute_names, :instantiator
def finder?
@finder && !@instantiator
end
def instantiator?
@finder == :first && @instantiator
end
def creator?
@finder == :first && @instantiator == :create
end
def bang?
@bang
end
def save_record?
@instantiator == :create
end
def save_method
bang? ? :save! : :save
end
end
end
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