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POHow do I reject if exists? for non-nested attributes?
 

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  1. POHow do I reject if exists? for non-nested attributes?
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    <p>Currently my controller lets a user submit muliple "links" at a time. It collects them into an array, creates them for that user, but catches any errors for the User to go back and fix. How can I ignore the creation of any links that already exist for that user? I know that I can use validates_uniqueness_of with a scope for that user, but I'd rather just ignore their creation completely. Here's my controller:</p> <blockquote> <p>@links = params[:links].values.collect{ |link| current_user.links.create(link) }.reject { |p| p.errors.empty? }</p> </blockquote> <p>Each link has a url, so I thought about checking if that link.url already exists for that user, but wasn't really sure how, or where, to do that. Should I tack this onto my controller somehow? Or should it be a new method in the model, like as in a before_validation Callback? (Note: these "links" are not nested, but they do belong_to :user.)</p> <p>So, I'd like to just be able to ignore the creation of these links if possible. Like if a user submits 5 links, but 2 of them already exist for him, then I'd just like for those 2 to be ignored, while the other 3 are created. How should I go about doing this?</p> <p>Edit: Thanks to Kandada, I'm now using this:</p> <blockquote> <p>@links = params[:links].values.collect.reject{ |link| current_user.links.exists?(:url=>link[:url])}</p> <p>@links = @links.collect{ |link| current_user.links.create(link) }.reject { |p| p.errors.empty? }</p> </blockquote> <p>So I separated the two, to first check if there are any that exist, then to create those that weren't rejected. Is there a better way to do this, like maybe combining the two statements would increase performance? If not, I think I'm pretty satisfied. (thank you again Kandada and j.)</p>
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