instance method `reader_method`

Ruby on Rails 4.0.13

Since v2.2.3 Private

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

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reader_method(name, class_name, mapping, allow_nil, constructor)

No documentation comment.

Parameters

name req
class_name req
mapping req
allow_nil req
constructor req

Source

# File activerecord/lib/active_record/aggregations.rb, line 230
        def reader_method(name, class_name, mapping, allow_nil, constructor)
          define_method(name) do
            if @aggregation_cache[name].nil? && (!allow_nil || mapping.any? {|pair| !read_attribute(pair.first).nil? })
              attrs = mapping.collect {|pair| read_attribute(pair.first)}
              object = constructor.respond_to?(:call) ?
                constructor.call(*attrs) :
                class_name.constantize.send(constructor, *attrs)
              @aggregation_cache[name] = object
            end
            @aggregation_cache[name]
          end
        end

Defined in activerecord/lib/active_record/aggregations.rb line 230 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::Aggregations::ClassMethods

Signature

Parameters