How can I validate a text_field_tag?

Rails
1

Hey people,

I was wondering whether it’s possible to validate a text_field_tag which
has nothing to do with the actual object being created?

Thanks

2

On Mar 17, 5:24 pm, Heinz S. [email protected]
wrote:

Hey people,

I was wondering whether it’s possible to validate a text_field_tag which
has nothing to do with the actual object being created?

validations are by definition a model centric thing. However there’s
nothing stopping you doing
if not_good(params[:some_text:])
…
else
@record.save
end

Fred

3

Heinz S. wrote:

Hey people,

I was wondering whether it’s possible to validate a text_field_tag which
has nothing to do with the actual object being created?

Thanks

What about JavaScript? For example, I call a Vlaidation method onsubmit
with a form when somebody creates a new object. Just a thought.

-S

4

Hey,

both are actually pretty good approaches I think but I was hoping I
could use that could use error_messages_for for the text_field_tag…
that’s probably not the case?
If I was using “if not_good(params…” I’d need to display it
differently. It’d be extremly handy if I could just add an error to
error_messages_for using “if not_good(…”

5

you could also [email protected]_valid?

which will validate w/o saving

On Mar 17, 11:00 am, Frederick C. [email protected]

6

But the text_field_tag has nothing to do with the @record so it wouldn’t
help if I was checking if the @record is valid, right?

tony wrote:

you could also [email protected]_valid?

which will validate w/o saving

On Mar 17, 11:00�am, Frederick C. [email protected]

7

since your text field tag isn’t part of the model, you could
instantiate the object with the value from the tag and then call
is_valid and check the errors variable if you want the message. else
you’ll have to write your own validation methods

On Mar 17, 3:15 pm, Heinz S. [email protected]

8

On Mar 17, 10:04 pm, Heinz S. [email protected]
wrote:

Hey,

both are actually pretty good approaches I think but I was hoping I
could use that could use error_messages_for for the text_field_tag…
that’s probably not the case?
If I was using “if not_good(params…” I’d need to display it
differently. It’d be extremly handy if I could just add an error to
error_messages_for using “if not_good(…”

You can call some_object.errors.add(…) to add errors to an
activerecord object (you probably need to make the validations run
first). Check out the errors class in the api.

Fred

9

Heinz,
If you’re looking to invalidate the object based on this non-member
field,
you could use
ActiveRecord.Errors.add_to_base()

e.g. @record.errors.add_to_base(“Invalid unpopple value”)

Then check validity with @record.errors.empty?
Note that @record.is_valid will still return true (unless you override
invalid? for the class).

Hope that helps,
James.

2009/3/17 Heinz S. [email protected]

10

Very nice. Very helpful. Thank you, James.

Best regards,
Bill