Turn of a single validation

Rails
1

During migration I would like to turn off a single validation.

That is, I don’t want to turn off all validations for a single record, I
want to turn of a single validation (of several) for all records.

2

On Feb 26, 3:18 am, Ralph S. [email protected] wrote:

During migration I would like to turn off a single validation.

That is, I don’t want to turn off all validations for a single record, I
want to turn of a single validation (of several) for all records.

If you’re using models in a migration you should usually be creating a
private copy of the class in the migration ie

class SomeMigration < …
class SomeModel < ActiveRecord::Base
end

def self.up
…
end
end

( see also

)

Fred

3

Frederick C. wrote:

If you’re using models in a migration you should usually be creating a
private copy of the class in the migration ie
. . .

Fred, thank you.

What you propose is the right way to do things. I’m looking for the
wrong way to do things … that is, I’m looking to turn off a validation
once it has been turned on.

Ralph

4

On 26 February 2010 13:24, Ralph S. [email protected] wrote:

once it has been turned on.
I think you missed Frederick’s point, (or I have missed yours). Note
that he is suggesting putting a local declaration of your model class
inside the migration. This means that any validations in your
model.rb file will not be seen. There should not be a need for
validations inside a migration, so the fact that all validations are
being ignored should not matter. (You are doing a migration not a
seed aren’t you?).

class SomeMigration < …
class SomeModel < ActiveRecord::Base
end

def self.up
…
end
end

5

Ralph S. wrote:

Colin L. wrote:

You are doing a migration not a
seed aren’t you?).

I’m doing a seed with “random” data and I want all the validations …
except one.
Seeds don’t belong in migrations, and anyway they shouldn’t need you to
turn off validations.

I know. I know. I’m bad bad bad. But this is a hack AND I’d like to
Don’t hack. Don’t do things you know are bad. Period.> know if the hack
can be done.

6

Colin L. wrote:

You are doing a migration not a
seed aren’t you?).

I’m doing a seed with “random” data and I want all the validations …
except one.

I know. I know. I’m bad bad bad. But this is a hack AND I’d like to
know if the hack can be done.

7

On Fri, Feb 26, 2010 at 7:39 PM, Ralph S. [email protected]
wrote:

Colin L. wrote:

You are doing a migration not a
seed aren’t you?).

I’m doing a seed with “random” data and I want all the validations …
except one.

Another option: If you can trust your seed data save(false) turns off
validations.

8

On Feb 26, 6:39 pm, Ralph S. [email protected] wrote:

Colin L. wrote:

You are doing a migration not a
seed aren’t you?).

I’m doing a seed with “random” data and I want all the validations …
except one.

I know. I know. I’m bad bad bad. But this is a hack AND I’d like to
know if the hack can be done.

You could probably twist the :if/:unless options for this, although it
will almost certainly come and bite you later on.

Fred