jquery - Temporary ID For new object rails -

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i trying upload photos through ajax on multistep form (which using ajax), problem facing in order upload photo , keep tied new object (lets call post) photo needs store posts id. can't post new object , id nil! have seen lot of websites when click create url looks "www.example.com/post?step=create&id=134813489134" whats weird id created, step rather simple user closes browser? object stay persist or deleted. in advance


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