Re: Compound validators usage

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Generally want SimpleFormValidators to be either pre_validators or
chained_validators see the docs here:
http://www.formencode.org/en/latest/Validator.html#compound-validators

So I would normally do:

class ProductConfigurationSchema(Schema):
    filter_extra_fields = True
    allow_extra_fields = True

     bool_field = validators.Bool()
     text_field = UnicodeString(max=100)

     chained_validators = [ SimpleFormValidator(validate_text) ]

In this case, the main validator gets the bare minimum validation (I must
be a unicode string and may have a max length of 100). Following on that
you do form level validation in the chained_validators so I would expect
validate_text do do something like make text_field required if bool_field
is true (Note that there is a good model for building that built in a
RequireIfMissing/RequireIfPresent
http://www.formencode.org/en/latest/modules/validators.html#formencode.validators.RequireIfMissing
).

One thing you can do with pre_validtors is throw data away if a value is
set. So if your Bool() field was for deletion, you could remove the other
data from the form so that incorrect data does not cause a validation error.

-Chris

On Sat, Jul 21, 2012 at 2:09 PM, Michael Jenny <[email protected]>wrote:

> Hi there,
>
> i have a schema validator and want to use another compound validator
> (SimpleFormValidator) from within the schema.
>
> E.g. I do something along the lines:
>
>
> def validate_text(value_dict, state, validator):
>
>      # validation of text_field goes here. check value_dict for
> bool_field's value to determine what to do next.
>
>
> class ProductConfigurationSchema(Schema):
>     filter_extra_fields = True
>     allow_extra_fields = True
>
>      bool_field = validators.Bool()
>      text_field = SimpleFormValidator(validate_text)
>
>
> This does not work as the schema does not expect that its fields are
> compound validators. It doesn't pass the value_dict to the
> SimpleFormValidator but rather a single value. This results in the
> following errror in SimpleFormValidators to_python method:
>
>     value_dict = value_dict.copy()
> AttributeError: 'unicode' object has no attribute 'copy'
>
>
> I followed that route because I want to achieve the following:
>
> The visibility of the text_field depends on the bool_field. Therefore I'd
> thought I write a custom method that checks the state of the bool when
> validating the text_field. If it is set, I would perform the actual
> validation. If the bool is not set, the text_field is irrelevant and
> validating would essentially be a no-op.
>
>
> Any tip how to tackle this?
>
>
> Cheers, prinz.
>
>
>
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>
>


-- 
Christopher Lambacher
[email protected]

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Generally want SimpleFormValidators to be either pre_validators or chained_=
validators see the docs here:<div><a href=3D"http://www.formencode.org/en/l=
atest/Validator.html#compound-validators">http://www.formencode.org/en/late=
st/Validator.html#compound-validators</a>=C2=A0</div>
<div><br></div><div>So I would normally do:</div><div><br></div><div><span =
style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;ba=
ckground-color:rgb(255,255,255)">class ProductConfigurationSchema(</span><s=
pan style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13p=
x;background-color:rgb(255,255,255)">Schema):</span><br style=3D"color:rgb(=
34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(=
255,255,255)">
<span style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:1=
3px;background-color:rgb(255,255,255)">=C2=A0=C2=A0=C2=A0 filter_extra_fiel=
ds =3D True</span><br style=3D"color:rgb(34,34,34);font-family:arial,sans-s=
erif;font-size:13px;background-color:rgb(255,255,255)">
<span style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:1=
3px;background-color:rgb(255,255,255)">=C2=A0=C2=A0=C2=A0 allow_extra_field=
s =3D True</span><br style=3D"color:rgb(34,34,34);font-family:arial,sans-se=
rif;font-size:13px;background-color:rgb(255,255,255)">
<span style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:1=
3px;background-color:rgb(255,255,255)">=C2=A0=C2=A0=C2=A0</span><br style=
=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;backgro=
und-color:rgb(255,255,255)">
<span style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:1=
3px;background-color:rgb(255,255,255)">=C2=A0=C2=A0=C2=A0=C2=A0 bool_field =
=3D validators.Bool()=C2=A0</span><br style=3D"color:rgb(34,34,34);font-fam=
ily:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">
<span style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:1=
3px;background-color:rgb(255,255,255)">=C2=A0=C2=A0=C2=A0=C2=A0 text_field =
=3D UnicodeString(max=3D100)</span></div><div><font color=3D"#222222" face=
=3D"arial, sans-serif">=C2=A0 =C2=A0 =C2=A0</font></div>
<div><font color=3D"#222222" face=3D"arial, sans-serif">=C2=A0 =C2=A0 =C2=
=A0chained_validators =3D [</font>
<span style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:1=
3px;background-color:rgb(255,255,255)">SimpleFormValidator(validate_</span>=
<span style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:1=
3px;background-color:rgb(255,255,255)">text)</span>=C2=A0]</div>
<div><br></div><div>In this case, the main validator gets the bare minimum =
validation (I must be a unicode string and may have a max length of 100). F=
ollowing on that you do form level validation in the chained_validators so =
I would expect validate_text do do something like make text_field required =
if bool_field is true (Note that there is a good model for building that bu=
ilt in a RequireIfMissing/RequireIfPresent=C2=A0<a href=3D"http://www.forme=
ncode.org/en/latest/modules/validators.html#formencode.validators.RequireIf=
Missing">http://www.formencode.org/en/latest/modules/validators.html#formen=
code.validators.RequireIfMissing</a>).</div>
<div><br></div><div>One thing you can do with pre_validtors is throw data a=
way if a value is set. So if your Bool() field was for deletion, you could =
remove the other data from the form so that incorrect data does not cause a=
 validation error.</div>
<div><br></div><div>-Chris</div><div><br><div class=3D"gmail_quote">On Sat,=
 Jul 21, 2012 at 2:09 PM, Michael Jenny <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:[email protected]" target=3D"_blank">[email protected]</a>&g=
t;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><p dir=3D"ltr">Hi there,</p><p dir=3D"ltr">i=
 have a schema validator and want to use another compound validator (Simple=
FormValidator) from within the schema.</p>
<p dir=3D"ltr"></p><p dir=3D"ltr"></p><p dir=3D"ltr">E.g. I do something al=
ong the lines:</p>

<p dir=3D"ltr"><br></p><p dir=3D"ltr">def validate_text(value_dict, state, =
validator):</p><p dir=3D"ltr">=C2=A0=C2=A0=C2=A0=C2=A0 # validation of text=
_field goes here. check value_dict for bool_field&#39;s value to determine =
what to do next. <br>

</p>
<p dir=3D"ltr"><br></p><p dir=3D"ltr">class ProductConfigurationSchema(Sche=
ma):<br>=C2=A0=C2=A0=C2=A0 filter_extra_fields =3D True<br>=C2=A0=C2=A0=C2=
=A0 allow_extra_fields =3D True<br>=C2=A0=C2=A0 <br>=C2=A0=C2=A0=C2=A0=C2=
=A0 bool_field =3D validators.Bool() <br>=C2=A0=C2=A0=C2=A0=C2=A0 text_fiel=
d =3D SimpleFormValidator(validate_text)</p>


<p dir=3D"ltr"><br></p><p dir=3D"ltr"></p><p dir=3D"ltr">This does not work=
 as the schema does not expect that its fields are compound validators. It =
doesn&#39;t pass the value_dict to the SimpleFormValidator but rather a sin=
gle value. This results in the following errror in SimpleFormValidators to_=
python method:<br>


</p><p dir=3D"ltr"></p><p dir=3D"ltr">=C2=A0=C2=A0=C2=A0 value_dict =3D val=
ue_dict.copy()<br>AttributeError: &#39;unicode&#39; object has no attribute=
 &#39;copy&#39;</p><p dir=3D"ltr"></p><p dir=3D"ltr"><br></p><p dir=3D"ltr"=
>I followed that route because I want to achieve the following:</p>


<p dir=3D"ltr">The visibility of the text_field depends on the bool_field. =
Therefore I&#39;d thought I write a custom method that checks the state of =
the bool when validating the text_field. If it is set, I would perform the =
actual validation. If the bool is not set, the text_field is irrelevant and=
 validating would essentially be a no-op.</p>


<p dir=3D"ltr"><br>Any tip how to tackle this?<br></p><p dir=3D"ltr"></p><p=
 dir=3D"ltr"><br></p><p dir=3D"ltr">Cheers, prinz.<br></p><p dir=3D"ltr"></=
p><p dir=3D"ltr"></p>
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r>
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threats. <a href=3D"http://www.accelacomm.com/jaw/sfrnl04242012/114/5012226=
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discuss</a><br>
<br></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>Christop=
her Lambacher<br><a href=3D"mailto:[email protected]">chris@kateandchr=
is.net</a><br>
</div>

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