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

I found the other responses to be a tad confusing having landed here to just figure out how to turn my OpenStruct into a Hash or JSON. To clarify, you can just call marshal_dump on your OpenStruct.

$ OpenStruct.new(hello: :world).to_json
=> "{\"table\":{\"hello\":\"world\"}}"

$ OpenStruct.new(hello: :world).marshal_dump
=> {:hello=>:world}

$ OpenStruct.new(hello: :world).marshal_dump.to_json
=> "{\"hello\":\"world\"}"

I personally would be hesitant to monkey-patch OpenStruct unless you're doing it on a subclass, as it may have unintended consequences.