yellowreign yellowreign - 1 year ago 115
Ruby Question

Rails Validate no White Space in User Name

I want to validate that a user name has no white/blank spaces for my Users. Is there a built in validation that does this? Or what is the best way to do this. Seems like it would be a pretty common requirement.

Answer Source

I would try format validator:

validates :username, format: { with: /\A[a-zA-Z0-9]+\Z/ }

as most of the time when you don't want whitespaces in username you also don't want other characters.

Or when you really only need to check for whitespace, use without instead:

validates :username, format: { without: /\s/ }

Full documentation: (validates ... format: {} is the same as validates_format_of ...)

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