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Asked: 2026-06-04T05:34:06+00:00

I’m almost finished step 11 on http://guides.rubyonrails.org/getting_started.html . There is something wrong with my

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I’m almost finished step 11 on http://guides.rubyonrails.org/getting_started.html .
There is something wrong with my tags though, i keep getting this when trying to create a new post.

ActiveModel::MassAssignmentSecurity::Error in PostsController#create

Can’t mass-assign protected attributes: tags_attributes
Rails.root: /Users/david/blog

Application Trace | Framework Trace | Full Trace
app/controllers/posts_controller.rb:46:in new'
app/controllers/posts_controller.rb:46:increate’
Request

Parameters:

    {"post"=>{"name"=>"David",
    "content"=>"Foobar",
    "title"=>"Programmer",
    "tags_attributes"=>{"0"=>{"name"=>"Tea,
    Cake"}}},
    "utf8"=>"✓",
    "commit"=>"Create Post",
    "authenticity_token"=>"MhvAkAPcAey1Z4YXy7nKFmW/wETlu+USSvWOEBBN4po="}

I’ve been over and over every line of code containing the implementation of tags, and i can’t figure it out. Some guidance to what i should be looking for?

Thank you.

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1 Answer

  1. Editorial Team

    In your model, you need to add tag_attributes to the attr_accessible call.

    For example :

    class User < ActiveRecord::Base
  attr_accessible :tags_attributes
end

    If you already call it once, you can either add this field as an argument of the method, or make a second call. Both options are equivalent.

    Having to specify all accessible parameters wasn’t a default until a few months.
    This guide has been updated to reflect the change of default. But the new version hasn’t been deployed yet, this is why it’s not specified.

    See Security: Mass Assignment

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