class ActiveModel::ValidationError

end
puts invalid.model.errors
rescue ActiveModel::ValidationError => invalid
complex_operation_that_internally_calls_validate!
begin
model method to retrieve the record which did not validate.
Raised by validate! when the model is invalid. Use the
= Active Model ValidationError

def initialize(model) 

def initialize(model)
  @model = model
  errors = @model.errors.full_messages.join(", ")
  super(I18n.t(:"#{@model.class.i18n_scope}.errors.messages.model_invalid", errors: errors, default: :"errors.messages.model_invalid"))
end