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copied!<p>My other answer was mostly wrong - new answer. </p> <p>in your params hash, :filename is not associated with another hash, it is associated with an ActiveDispatch::Http::UploadedFile object. Your last code line:</p> <pre><code>def screenshot_params params.require(:screenshot).permit(:title, assets_attributes: :filename) </code></pre> <p>is actually correct, however, the filename attribute is not being allowed since it is not one of the permitted <a href="https://github.com/rails/rails/blob/16e0c8816c4c8a9fb5292278bf5753b026c1105c/actionpack/lib/action_controller/metal/strong_parameters.rb#L362">scalar types</a>. If you open up a console, and initialize a params object in this shape:</p> <pre><code>params = ActionController::Parameters.new screenshot: { title: "afa", assets_attributes: {"0" => {filename: 'a string'}}} </code></pre> <p>and then run it against your last line:</p> <pre><code>p = params.require(:screenshot).permit(:title, assets_attributes: :filename) # => {"title" => "afa", "assets_attributes"=>{"0"=>{"filename"=>"abc"}}} </code></pre> <p>However, if you do the same against a params hash with the uploaded file, you get </p> <pre><code>upload = ActionDispatch::Http::UplaodedFile.new tempfile: StringIO.new("abc"), filename: "abc" params = ActionController::Parameters.new screenshot: { title: "afa", assets_attributes: {"0" => {filename: upload}}} p = params.require(:screenshot).permit(:title, assets_attributes: :filename) # => {"title" => "afa", "assets_attributes"=>{"0"=>{}}} </code></pre> <p>So, it is probably worth a bug or pull request to Rails, and in the meantime, you will have to directly access the filename parameter using the raw <code>params</code> object:</p> <pre><code>params[:screenshot][:assets_attributes]["0"][:filename] </code></pre>

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