This method is deprecated or moved on the latest stable version.
The last existing version (v2.3.8) is shown here.
These similar methods exist in v4.2.7:
Performs the opposite of valid?. Returns
true if errors were
added, false otherwise.
# File activerecord/lib/active_record/validations.rb, line 1125
APIdock release: IRON STEVE (1.4)
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