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Editorial Team
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Asked: 2026-05-18T09:52:56+00:00

I am using Mongoid on Rails 3 and trying to build a nested form.

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I am using Mongoid on Rails 3 and trying to build a nested form. The problem I run into is when I used accept_nested_attributes_for method, I get this error message:

undefined method `persisted?' for []:Array

Is anyone else having problem with nested forms in Mongoid? What can I do to fix it?

Edit: more about the error. This is the full trace.

mongoid (2.0.0.beta.19) lib/mongoid/criteria.rb:156:in `send'
mongoid (2.0.0.beta.19) lib/mongoid/criteria.rb:156:in `method_missing'
mongoid (2.0.0.beta.19) lib/mongoid/associations/references_many.rb:113:in `send'
mongoid (2.0.0.beta.19) lib/mongoid/associations/references_many.rb:113:in `method_missing'
actionpack (3.0.1) lib/action_view/helpers/form_helper.rb:1280:in `fields_for_nested_model'
actionpack (3.0.1) lib/action_view/helpers/form_helper.rb:1273:in `fields_for_with_nested_attributes'
actionpack (3.0.1) lib/action_view/helpers/form_helper.rb:1155:in `fields_for'
simple_form (1.2.2) lib/simple_form/action_view_extensions/builder.rb:96:in `simple_fields_for'
app/views/users/profile.html.haml:16:in `_app_views_users_profile_html_haml__599717908_2187897020_0'
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1 Answer

  1. Editorial Team

    This issue was fixed by a recent pull request I found in Github by wink.

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