aggregations.rb

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# the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

module Elasticsearch
  module Model
    module Response

      class Aggregations < HashWrapper
        disable_warnings if respond_to?(:disable_warnings)

        def initialize(attributes={}, options= {})
          __redefine_enumerable_methods super(attributes)
        end

        # Fix the problem of Hashie::Mash returning unexpected values for `min` and `max` methods
        #
        # People can define names for aggregations such as `min` and `max`, but these
        # methods are defined in `Enumerable#min` and `Enumerable#max`
        #
        #     { foo: 'bar' }.min
        #     # => [:foo, "bar"]
        #
        # Therefore, any Hashie::Mash instance value has the `min` and `max`
        # methods redefined to return the real value
        #
        def __redefine_enumerable_methods(h)
          if h.respond_to?(:each_pair)
            h.each_pair { |k, v| v = __redefine_enumerable_methods(v) }
          end
          if h.is_a?(Hashie::Mash)
            class << h
              define_method(:min) { self[:min] }
              define_method(:max) { self[:max] }
            end
          end
        end
      end

    end
  end
end