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Form Errors

• simple validation: validates_presence_of :name
• if the object fails this validation, then object.errors will contain an array of errors that the validation will add

# Useful error methods
object.errors.clear
object.errors.size
object.errors.each {|attr, mesg| ...}
# attr: name
# msg: name can't be blank

#returns complete sentences of the attribute and it errors
object.errors.full_messages.each {|msg| ...}