def view_by *keys
opts = keys.pop if keys.last.is_a?(Hash)
opts ||= {}
self['views'] ||= {}
method_name = "by_#{keys.join('_and_')}"
if opts[:map]
view = {}
view['map'] = opts.delete(:map)
view['reduce'] = opts.delete(:reduce) if opts[:reduce]
self['views'][method_name] = view
else
doc_keys = keys.collect{|k| "doc['#{k}']"}
key_emit = doc_keys.length == 1 ? "#{doc_keys.first}" : "[#{doc_keys.join(', ')}]"
guards = opts.delete(:guards) || []
guards += doc_keys.map{|k| "(#{k} != null)"} unless opts.delete(:allow_nil)
guards << 'true' if guards.empty?
map_function = "function(doc) {\nif (\#{guards.join(' && ')}) {\nemit(\#{key_emit}, null);\n}\n}\n"
self['views'][method_name] = {
'map' => map_function
}
end
self['views'][method_name]['couchrest-defaults'] = opts unless opts.empty?
method_name
end