Ruby/Rails - How to include something from the join table on as_json method option

Question

So I have a many to many relationship. I am storing a status string on the join table.

Example: Order has many Items on it. Items are fixed. On the OrdersItems table we store a string called item_status. I want to return the Order using as_json.

  def as_json(options={})
    opts = {
      only: PUBLIC_ATTRIBUTES,
      methods: [:items],
    }.merge(options){|k,o,n|o|n}
    super(opts)
  end

This works, except I want to add that item_status to each hash in the items array. How can I do this?

roo · Accepted Answer · 2017-06-25 12:17:27Z

1

You can include associated models as part of the options given to to_json, with more or less the same configuration options.

opts = {
  only: PUBLIC_ATTRIBUTES,
  include: {
    items: {
      only: [:status]
    }
  }
}

See: https://apidock.com/rails/ActiveRecord/Serialization/to_json

answered Jun 25, 2017 at 12:17

roo

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