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# File 'lib/nifty_scope.rb', line 7
def nifty_scope(params, options = {})
if options.has_key?(:only)
options[:only] = Array(options[:only])
params.slice!(*options[:only])
elsif options.has_key?(:except)
options[:except] = Array(options[:except])
params.except!(*options[:except])
end
mapping ||= options[:mapping] || {}
scope = where(nil)
params.each do |(key, value)|
key = key.to_sym
scope_method = if mapping.has_key?(key)
mapping[key]
else
key
end
if scope_method.is_a?(Symbol) && !scope.respond_to?(scope_method)
raise IrresponsibleScope, "#{scope.name} can't respond to ##{scope_method} method"
end
scope = if scope_method.is_a?(Proc)
scope.instance_exec(value, &scope_method)
else
scope.send(scope_method, value)
end
end
scope
end
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