Hi, I think GAE is a wonderful development environment, and the Python
version is really empowering. However, I have decided to make my life
easier by writing a form-generating library suitable for CMS like editing
(admin stuff). I think Django is too big.
Requirements:
- work well with jinja2, but not assume jinja2
- work well with the ndb modelling
- possible to extend the library to allow dynamic online creation of forms
- allow multiple ndb objects in a form
- allow multipe objects of the same class in a form
- allow partial updates of objects (only touch some fields)
- return the form content untouched to the browser when validators fail,
but indicating the field errors
- efficient instancing/generating/handling of forms
More suggestions?
My experience with GAE is somewhat limited so I am not quite sure how to
best represent this in Python.
I am thinking usage along these lines (pseudocode) for GET:
form = Form(
objs={'SITE':model.SiteInfoDbModel,'USR1':model.UserDbModel,'USR2':model.
UserDbModel},
)
form.set_template(
(Form.GROUP, # generates a DIV or other grouping mechanism
(form.SITE.sitename, 40), # allow editing of sitename string 40 chars
line
(form.USR1.fullname, 50), # 50 chars line
(form.USR1.description, 50,15) # generate multi line editing
(Form.READONLY,'edited by',form.USR2.username)
)
)
form.attach_db_objects(fetch_siteinfo(),fetch_admin(),fetch_currentuser())
self.response.out.write(template.render(form=form))
and something like this for POST:
form.attach_db_objects(fetch_siteinfo(),fetch_admin(),fetch_currentuser())
try:
form.set_from_request(self.request)
form.validate_and_commit()
self.response.out.write(template.render(form=form,message='Data Stored'))
except ValidationError:
self.response.out.write(template.render(form=form,message='Validation
failed, not stored'))
It might be better to use classes rather than lists for the form template.
Comments?
Ola.
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