Hanami 1.3 -> Hanami 2.0

questions
2

My first trouble:

I have JSONB columns in my entities. Before, reading them by Hanami::Model, resulted in a hash. After switching to ROM, the column read from DB returns JSON.

# Before (Hanami::Model)
message.payload
# => { author: "Jsmith", content: "My message" }

# After (ROM 5.0)

# frozen_string_literal: true

module Entities
  class Message < ROM::Struct
  end
end

# frozen_string_literal: true

module Persistence
  module Relations
    class Messages < ROM::Relation[:sql]
      schema(:messages, infer: true)

      auto_struct true
    end
  end
end

class MessageRepository < Rom::Repository[:messages]
end

MessageRepository.new.messages.first.payload
# =>  "{\"author\":\"Jsmith\",\"content\":\"My message\"}"

Question: How I should configure a Mapper for all JSONB columns in my system at once?

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