How can I validate a text_field_tag?

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

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

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

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 could also [email protected]_valid?

which will validate w/o saving

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

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]

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]

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

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]

Very nice. Very helpful. Thank you, James.

Best regards,
Bill

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