What does the error message "missing required keys: [:entry_id]" indicate in Rails with nested resources?

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The error message "missing required keys: [:entry_id]" in Rails with nested resources indicates that there is a missing parameter in the URL for the nested resource. The parameter that is missing is the ID of the parent resource that the nested resource belongs to. This error can occur when trying to access or create a nested resource without providing the necessary parent resource ID in the request URL.