Turn a Ruby Array built from a mongoid query into an actual mongoid object, or re write method to return a mongoid object?

Question

I have a mongoid model called Department and a separate model called User, and there is no native relationship between the two models. Because of how the relationships in my application work, I manually store document ID's on the User model.

I am using the Grape framework for Ruby, and it has a filter system that sits on top of Mongoid objects called Entities, and it rejects anything that isnt a mongoid query response object, because this method returns a ruby Array instead of a Mongoid object, my framework gives me errors.

Is there any way to re write my function to return a Mongoid object? or is there any way I can convert an array of Mongoid Objects into one Mongoid object?

## inside Department Model
def self.user_can_access(user = nil)
  if user != nil
    departments = []
    ## department_access_keys are embedded documents belonging to a user
    user.department_access_keys.each do |key|
      departments << BACKBONE::Department.find(key.key)
    end
    departments ## => returns an array of Department Documents that a user has been granted access to
  else
    raise 'user was not defined'
  end
end

Aleksei Matiushkin · Accepted Answer · 2017-07-17 07:07:20Z

2

I believe, “Mongoid Object” should be just a hash, so this should work (also note Enumerable.map instead of phpish each { << }):

## inside Department Model
def self.user_can_access(user = nil)
  raise 'user was not defined' if user.nil?

  {
    departments: # return hash here
      user.department_access_keys.map do |key|
        BACKBONE::Department.find(key.key)
      end
  }
end

answered Jul 17, 2017 at 7:07

Aleksei Matiushkin

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Comments

engineersmnky · Accepted Answer · 2017-07-17 17:23:33Z

0

Can't you just use find like this?

departments = BACKBONE::Department.find(*user.department_access_keys.map(&:key))

I am not very familiar with mongoid but the Documentation seems to suggest that this is exactly how to achieve what you want.

Criteria#find Find a document or multiple documents by their ids. Will raise an error by default if any of the ids do not match.

Examples:

Band.find("4baa56f1230048567300485c")
Band.find(
  "4baa56f1230048567300485c",
  "4baa56f1230048567300485d"
)
Band.where(name: "Photek").find(
  "4baa56f1230048567300485c"
)

answered Jul 17, 2017 at 17:23

engineersmnky

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1 Comment

alilland Over a year ago

thank you! I have no idea why Grape Entities don't accept arrays, but this solved my problem!

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