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module ActiveRecord
# = Active Record Dynamic Scope Match
#
# Provides dynamic attribute-based scopes such as <tt>scoped_by_price(4.99)</tt>
# if, for example, the <tt>Product</tt> has an attribute with that name. You can
# chain more <tt>scoped_by_* </tt> methods after the other. It acts like a named
# scope except that it's dynamic.
class DynamicScopeMatch
def self.match(method)
ds_match = self.new(method)
ds_match.scope ? ds_match : nil
end
def initialize(method)
@scope = true
case method.to_s
when /^scoped_by_([_a-zA-Z]\w*)$/
names = $1
else
@scope = nil
end
@attribute_names = names && names.split('_and_')
end
attr_reader :scope, :attribute_names
def scope?
!@scope.nil?
end
end
end
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