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    <p>The <code>merge</code> method that you're calling is just the usual Ruby <code>Hash#merge</code> method. For each key in the argument of <code>merge</code>, the value overwrites the value that is currently present for that key, if any. In this case, you are overwriting the value of <code>sections_attributes</code>.</p> <p>Since <code>sections_attributes</code> is a "pseudo-array" of the form <code>{"0" =&gt; first_hash, "1" =&gt; second_hash}</code> and so on, you need a way to duplicate your <code>user</code> once per entry. You can do that by using the ability of merge take a block that changes the merged value. Here's one approach:</p> <pre><code>filtered_params = params.require(:post) .permit([:title, :body, sections_attributes: [:title, :section_type]]) additional_params = {user: current_user, sections_attributes: [user: current_user]} result = filtered_params.merge(additional_params) do |key, oldval, newval| if newval.is_a? Array # Arrays are expected to be one-element arrays containing a Hash that is # supposed to be merged into each element of the currently-existing # "pseudo-array" oldval ||= {} Hash[oldval.map {|k, v| [k, v.merge(newval.first)]}] elsif newval.is_a? Hash # Hashes are merged into existing hashes oldval ||= {} oldval.merge newval else # Other types are passed as-is (and replace any existing value) newval end end # This marks the newly added parameters as permitted. It's only necessary because we # made new Hashes when we modified the "pseudo-array" result.permit! </code></pre> <p>If you find that this works for you, you could encapsulate this in a method, either by taking the inside of the block and making it a separate method, or by installing the whole thing as a named method on the <code>Parameters</code> class.</p> <p>Note also that the above only handles one layer of recursion. Going deeper than this is a bit tricky. If you need to do it, I'd be happy to write up an explanation.</p>
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    1. COThis seems to be a step in the right direction. However, applying `deep_merge` to the params I get this error `undefined method `with_indifferent_access' for #<User:0x00000006a18398>`.
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    2. COInteresting. Can you post a backtrace for the error?
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    3. COThanks for looking into this. I've added the backtrace above.
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