Nested association in Rails for rendering as JSON is a powerful feature that allows you

I have managed to solve 90% of my issue with previous questions, but I've hit a obstacle.

My models include CheckIns and Person, where CheckIns are associated with People.

In my controller, I currently have this code:

data = CheckIn.all
render json: { data: data }

Now, for each CheckIn, I want to nest the corresponding Person inside it. Previous answers on StackOverflow suggest using the following approach:

data = CheckIn.all
render json: data.to_json include: :person

However, this poses a challenge in nesting my data within a wrapper JSON object as before because to_json generates a string rather than a Hash.

Ultimately, I desire the wrapper JSON object to adhere to a consistent JSON output structure, where data is consistently found under a data: field, with the ability to attach additional metadata to the response.

Is there a way to achieve the effect of the include: flag for to_json while maintaining the wrapper object intact? The solution provided previously involving parsing JSON seems messy and not ideal for me:

data = CheckIn.all
render json: { data: JSON.parse data.to_json(include: :person) }

Thank you! I'm hopeful that there is an elegant way to accomplish this in Rails.

Answer №1

Active Records offer support for eager loading http://guides.rubyonrails.org/active_record_querying.html#eager-loading-associations

If you want to load checkins associated with a user:

@users = User.all.includes(:checkins)

This query will generate:

User Load (0.2ms)  SELECT "users".* FROM "users"
Checkin Load (0.1ms)  SELECT "checkins".* FROM "checkins"  WHERE "checkins"."user_id" IN (1)

However, this method won't allow you to render your nested objects. To achieve this, you need to Decorate your data.

Consider using https://github.com/nesquena/rabl or github.com/rails/jbuilder

These tools will enable you to provide decorators with templates and data objects for rendering.

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