Rails 5 get enum key via integer value

Question

I have a model that has the follow enum:

class User < ApplicationRecord
    enum user_type: [:api_user, :web_user]
end

When this gets saved into the database, it saves it with the integer value, as expected. I then have a function that accepts the enum like this (in a controller):

do_something_useful(type: User.user_types[:web_user], user: user)

def do_something_useful(options)
    some_enum_value = options[:type]
    user = options[:user]

    # Not a practical example.  Just an example to demonstrate the issue.

    # Should return Hello, User! You are a web_user type.
    # But returns, Hello, User! You are a 1 type.
    'Hello, #{user.name}! You are a #{some_enum_value} type.'
end

The problem I'm encountering is that the options[:type] is passing the integer value. I'd like to get the key value of User.user_type by the integer. Is this possible?

Thanks again.

Since you're passing in a user object, and, assuming that it has been assigned a user_type, why don't you interrogate it directly to see what user type it is? user.user_type => "web_user" — Paul Fioravanti
– Paul Fioravanti, Commented Jul 30, 2016 at 6:11
Possible duplicate of in Ruby, how to extract a key from the Hash having the value — Daniel Cukier
– Daniel Cukier, Commented Jul 1, 2017 at 13:11

Lukasz Muzyka · Accepted Answer · 2017-11-03 11:24:16Z

16

Well, did a bit more searching and found this solution:

User.user_types.key(options[:type])

This will return the key.

Is this the easiest way? Or another better solution?

edited Nov 3, 2017 at 11:24

Lukasz Muzyka

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answered Jul 29, 2016 at 22:03

Sean

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2 Comments

Hamdan Over a year ago

now index method will be deprecated. You should be used the key method. Just updating.

Arnold Roa Over a year ago

index is deprecated, use .key instead, is the same.

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