Collecting hashes into OpenStruct creates “table” entry

Question

Why this (evaluated in Rails console)

[{:a => :b}].collect {|x| OpenStruct.new(x)}.to_json

adds a \"table\" record in there?

Answer 1

Because @table is a instance variable of OpenStruct and Object#as_json returns Hash of instance variables.

In my project, I implemented OpenStruct#as_json to override the behaviour.

require "ostruct"
class OpenStruct
  def as_json(options = nil)
    @table.as_json(options)
  end
end