Model -> model validations

Rails
1

If I have a site model that has_many :equipments, how would I validate
the equipment only when ceratin conditions exist in the site model?

I add the equipment dynamically in the Site form and also the form
will not necessarily be “fully submitted” until some conditions exist
in the main site form.

2

This maybe of some help:

Cheers,
Nicholas

3

Well sort of. I really need to validate another model based on the
original
form(model) conditions.

On Tue, Jul 28, 2009 at 10:25 PM, Nicholas H.

4

2009/7/29 Chris H. [email protected]:

Well sort of. I really need to validate another model based on the original
form(model) conditions.

Do you mean you are trying to validate a model that has already been
written to the database, when a form for a different model is
submitted? If not I think a little more detail in exactly what you
are trying to do may help.

Colin

5

Yes, Site is the main model, equipment is associated. I only want to
validate the equipment model when conditions exist in the site model.

6

2009/7/29 Chris H. [email protected]:

Yes, Site is the main model, equipment is associated. Â I only want to
validate the equipment model when conditions exist in the site model.

Is that ‘yes’ in response to ’ Do you mean you are trying to validate
a model that has already been written to the database’? If so then
that does not make sense. Validation is about checking that data is
correct before allowing it to be written to the db. If it is already
in the db it is too late to validate it.

Colin

7

Well it may not seem like it does not make sense but in the context of
this
app it does with the what the form is supposed .
This is our flow.

  1. Site is installed with eqpt.

  2. The person using the form puts all eqpt that is on site attached to
    the
    form dynamically.

  3. I have fields for the eqpt showing that it is installed correctly,
    settings are correct , …

  4. You can add eqpt but is might not necessarily be installed
    correctly,
    have issues, blah…

Step 4 is the reason that the form may be “submitted” but not fully
processed until the issues at a site get resolved.

8

2009/7/29 Chris H. [email protected]:

Well it may not seem like it does not make sense but in the context of this
app it does with the what the form is supposed .

Pardon?

This is our flow.

  1. Site is installed with eqpt.
  2. The person using the form puts all eqpt that is on site attached to the
    form dynamically.
  3. Â I have fields for the eqpt showing that it is installed correctly,
    Â settings are correct , …
  4. Â You can add eqpt but is might not necessarily be installed correctly,
    have issues, blah…
    Step 4 is the reason that the form may be “submitted” but not fully
    processed until the issues at a site get resolved.

No, sorry, I am completely flummoxed now, I have no idea what you are
trying to do. You are not explaining the problem in terms that I
understand, which may well be my fault.

Colin

9

I have the main form “Site”, has many :equipments.
In the Site form I add equipment to the form dynamically to associate it
to
the site.

I do not necessarily need to validate the equipment fields on the form
submission unless a checkbox is checked on the “Site” form stating
everything is good.

Basically I only need to validate the equipment under specific case on
the
site model.

10

2009/7/29 Chris H. [email protected]:

I have the main form “Site”, has many :equipments.
In the Site form I add equipment to the form dynamically to associate it to
the site.
I do not necessarily need to validate the equipment fields on the form
submission unless a checkbox is checked on the “Site” form stating
everything is good.
Basically I only need to validate the equipment under specific case on the
site model.

So, is this it? A user has entered data for an Equipment record onto
the form and submitted it, you have some validations defined but you
only want to run them if the associated site record (in the db) has a
particular flag set? If the flag in the db is not set then you want
to save the Equipment record without validating?

Colin

11

Ya, now that you said a flag would be good. I was initially referring
to
the main Site model initiating the validation for the equipment but a
flag
in the equipment model would probably be an easier solution.

12

Hello Chris:

There’s also an :if option for the validates_associated class method:

“:if - Specifies a method, proc or string to call to determine if the
validation should occur (e.g. :if => :allow_validation, or :if =>
Proc.new { |user| user.signup_step > 2 }). The method, proc or string
should return or evaluate to a true or false value.”

http://apidock.com/rails/ActiveModel/Validations/ClassMethods/validates_associated

Cheers,
Nicholas

13

I think from your description you don’t really want ‘validations’ in the
rails sense. You might want to look into using some sort of state
machine
and do some conditions checking of the interrelated models when the main
model is saved.

On Wed, Jul 29, 2009 at 1:09 PM, Chris H. [email protected]
wrote:

Ya, now that you said a flag would be good. I was initially referring to
the main Site model initiating the validation for the equipment but a flag
in the equipment model would probably be an easier solution.

–
Cynthia K.
[email protected]