How come Hobo doesn’t display an input for my has_one?

Historically, has_one was a bastard cousin to has_many that made it difficult to support. We also haven’t generally found the need for it, perhaps because it’s not available to us. In the meantime you can approximate a has_one by using a has_many with validates_length_of to constrain it to a single item.

That being said, Peter Pavlovich is working on support for has_one.

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