Raised by save! and create! when the record is invalid. Use the record method to retrieve the record which did not validate. 

  begin
    complex_operation_that_calls_save!_internally
  rescue ActiveRecord::RecordInvalid => invalid
    puts invalid.record.errors
  end
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February 14, 2009
1 thank

Clear and simple rescue

noxyu3m, your code is rescuing all exceptions, not just ActiveRecord::RecordInvalid.

I think this syntax is a bit more clear than using the global variable.

def create
  @model = Model.new(params[:model)
  @model.save!
rescue => err                          # rescues all exceptions
  logger.error(err.to_s)
end
February 14, 2009
0 thanks

Simple rescue

Take it easy:

def create
  @model = Model.new(params[:model)
  @model.save!
rescue
  logger.error(!$.to_s)
end

Global variable !$ refers to the Exception object.

April 15, 2009
0 thanks

Using global $! to address exception

@noxyu3m: Your code is actually syntactically wrong. The global is called $!

Your code should have been:

def create
  @model = Model.new(params[:model)
  @model.save!
rescue
  logger.error($!.to_s)
end

Although I would prefer

def create
  @model = Model.new(params[:model)
  @model.save!
rescue ActiveRecord::RecordInvalid
  logger.error($!.to_s)
end

to only catch expected exceptions, just like the documentation proposed.