I want to connect two entity (project and issues) and Rails says some error message, but I don’t know, what should I do. Can you help me fix it, please? Thanks a lot.

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Not sure what your are trying to do, but it looks like you have a nested resource and therefore want to pass an array to
form_for, but you are actually passing two separate objects. Change:to:
With this change you’ll pass one array for
form_for, instead of two arguments.