WTForms-flask: organize formfield name and data into dictionary - dictionary

Question

I've been stuck on this for some time now:
I have a form like so:
class attributes(Form):
height=IntegerField('height')
weight=IntegerField('weight')
class main(Form):
John=FormField(attributes)
Ted=FormField(attributes)
David(FormField(attributes)`
I wish to iteratively create a dictionary to store an identifying field label and field data in flask without using John_height=John.height.data for every FormField. The idea is to eventually pass the dictionary for writing into a database using a SQL statement where the dictionary key will match the database column and formfield data will be the database values.
The dictionary should look something like this:
{John_height : 170,
John_weight: 170,
Ted_height : 120,
Ted_weight: 190,
David_height : 150,
David_weight: 100}
Thank you in advance.

Answer 1

from wtforms import Form
from wtforms.fields import IntegerField, FormField
class Attributes(Form):
height = IntegerField('height')
weight = IntegerField('weight')
To build your forms iteratively you can do either of these:
def main(people=['John', 'Ted', 'David']):
class Main(Form):
pass
for person in people:
setattr(Main, person, FormField(Attributes))
return Main()
or
class Main(Form):
for person in ['John', 'Ted', 'David']:
vars()[person] = FormField(Attributes)
del person
personally I prefer the second since it is a proper class structure but less dynamic.
To build your dictionary you can then do the following:
obj = Main()
data = dict()
for field in obj: # <- this works since obj has an __iter__ method self defined
for key in field.data.keys():
data.update({field.name + '_' + key: field.data[key]})
print(data)
>>> {'John_height': None, 'John_weight': None, 'Ted_height': None, 'Ted_weight': None, 'David_height': None, 'David_weight': None}
The None values are due to empty form construction.