Mongoid Identity Map setting not taking effect in Rails console

Question

It does not appear that the identity_map setting is getting picked up from the config/mongoid.yml file.

Here's the file:

development:
  sessions:
    default:
      uri: mongodb://localhost:27017/test_development
      options: &defaultopts
        op_timeout: 60
        allow_dynamic_fields: false
        identity_map_enabled: true
        preload_models: true
        raise_not_found_error: false

When this is run through RAILS_ENV=development rails console the map is not turned on:

$ RAILS_ENV=development rails c
Loading development environment (Rails 3.2.13)
[1] pry(main)> Mongoid.using_identity_map?
=> false
[2] pry(main)> Mongoid.identity_map_enabled?
=> false

Even an attempt to manually load Mongoid and the file doesn't change it:

[3] pry(main)> require 'mongoid'
=> false
[4] pry(main)> Mongoid.load!("./config/mongoid.yml")
=> {"sessions"=>
  {"default"=>
    {"uri"=>"mongodb://localhost:27017/test_development",
     "options"=>
      {"op_timeout"=>60,
       "allow_dynamic_fields"=>false,
       "identity_map_enabled"=>true,
       "preload_models"=>true,
       "raise_not_found_error"=>false}}}}
[5] pry(main)> Mongoid.using_identity_map?
=> false
[6] pry(main)> Mongoid.identity_map_enabled?
=> false

Only if I manually set the value does it take affect:

[8] pry(main)> Mongoid.identity_map_enabled = true
=> true
[9] pry(main)> Mongoid.using_identity_map?                                                                                                                                                                                                    
=> true
[10] pry(main)> Mongoid.identity_map_enabled?
=> true

Why is the setting not being loaded correctly?

This issue is happening using Rails 3.2.13 and Mongoid 3.1.2.

jwieringa · Accepted Answer · 2013-06-10T20:48:58.927

:options shouldn't be nested in :default. Mongoid is expecting to see mongoid.yml in the format:

development:
  sessions:
    default:
      uri: mongodb://localhost:27017/test_development
  options:
    op_timeout: 60
    allow_dynamic_fields: false
    identity_map_enabled: true
    preload_models: true
    raise_not_found_error: false

See source where :options are being loaded.

 $ pry
 [1] pry(main)> require 'mongoid'
 => true
 [2] pry(main)> Mongoid.load!("./mongoid.yml", :production)
 => {"sessions"=>
    {"default"=>{"database"=>"mongoid_prod", "hosts"=>["localhost:27017"]}},
    "options"=>{"identity_map_enabled"=>true, "include_root_in_json"=>true}}
 [3] pry(main)> Mongoid.using_identity_map?
 => true
 [4] pry(main)>

EDIT: As pointed out by @cbmanica, there are multiple places where options can be set. For example we could have:

development:
  sessions:
    default:
      uri: mongodb://localhost:27017/test_development
      options:
        consistency: :strong
  options:
    op_timeout: 60

For the options that are set on the MongoDB database, they cannot be nested inside of session. See source for the defaults.

The Mongoid documentation seems to directly contradict your assertion that `:options` shouldn't be nested in `:default`: http://mongoid.org/en/mongoid/docs/installation.html. — cbmanica, May 30 '13 at 23:04
@cbmanica There are multiple options that can be set, I edited my answer to highlight that. In the [documentation](http://mongoid.org/en/mongoid/docs/installation.html) take a look at the "Anatomy of a Mongoid Config" section for examples of multiple options being set in multiple keys. — jwieringa, May 31 '13 at 23:57

Mongoid Identity Map setting not taking effect in Rails console

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