Choosing the partner

In order to choose a partner to work with, we simply create a form with a single field, which we can populate with values obtained from the database. In order to accomplish this, we need the following:

• A Django form with a ChoiceField()
• A domain service method that performs the lookup that populates the field

For this purpose, in the property app within our Django website, we define the following form:

class ChoosePartnerForm(forms.Form) :
    partSvc     = PartnerService(Config())
    partKeys    = partSvc.fetchPartnerKeys()
    alnumPunc = RegexValidator(r'^[\w\.\-\,\"\' ]+$',
        'Only letters, numbers, spaces and punctuation are allowed.')
    prop_partnerKey = forms.ChoiceField(label='Partner',choices=partKeys)

We also need a method in the partner domain service to retrieve partner names and keys for display, which we call fetchPartnerKeys(). We use the projection argument to the pymongo.collection.find() method to limit...