construct_model

# File activerecord/lib/active_record/associations/join_dependency.rb, line 239
        def construct_model(record, node, row, model_cache, id)
          other = record.association(node.reflection.name)

          model = model_cache[node][id] ||=
            node.instantiate(row, aliases.column_aliases(node)) do |m|
              other.set_inverse_instance(m)
            end

          if node.reflection.collection?
            other.target.push(model)
          else
            other.target = model
          end

          model.readonly! if node.readonly?
          model
        end