This module works closely with edc_visit_tracking and edc_visit_schedule.

Subject data is collected on predefined timepoints. We describe these data collection timepoints in a visit_schedule as provided by edc-visit-schedule. In edc-appointment timepoints are represented by appointments. edc-appointment provides classes for creating and managing appointments.

See also edc-visit-schedule.

A model mixin for the Appointment model. Each project may have one appointment model. For example:

class Appointment(AppointmentModelMixin, RequiresConsentModelMixin, BaseUuidModel):

    class Meta(AppointmentModelMixin.Meta):
        consent_model = 'edc_example.subjectconsent'
        app_label = 'edc_example'

The Appointment model is a required foreignkey for the visit report. Be sure to set on_delete=PROTECT.

class SubjectVisit(VisitModelMixin, OffstudyMixin, CreatesMetadataModelMixin, RequiresConsentModelMixin, BaseUuidModel):

    appointment = models.OneToOneField(Appointment, on_delete=PROTECT)

    objects = VisitModelManager()

    class Meta(VisitModelMixin.Meta):
        consent_model = 'edc_example.subjectconsent'
        app_label = 'edc_example'

A model mixin for the model that triggers the creation of appointments when the model is saved. This is typically an enrollment model.

Adds the model field facility. The value of field facility tells the CreateAppointmentsMixin to create appointments for the subject on dates that are available at the facility.

class Enrollment(EnrollmentModelMixin, CreateAppointmentsMixin, RequiresConsentModelMixin, BaseUuidModel):

    class Meta(EnrollmentModelMixin.Meta):
        visit_schedule_name = 'subject_visit_schedule.schedule1'
        consent_model = 'edc_example.subjectconsent'
        app_label = 'edc_example'

When Enrollment declared above is saved, one appointment will be created for the subject for each visit in schedule schedule1 of visit_schedule subject_visit_schedule.

Note: the value for facility must be provided by the user, either through the form interface or programmatically.

see edc_facility

The Appointment model is declared with AppointmentManager. It has several useful methods.

Returns the first (or last) appointment. If just the subject_identifier is provided, the first appointment of the protocol for the subject is returned. To be more specific, provide {subject_identifier=subject_identifier, visit_schedule_name=visit_schedule_name}. To be even more specific, {subject_identifier=subject_identifier, visit_schedule_name=visit_schedule_name, schedule_name=schedule_name}.

The most common usage is to just provide these values with an appointment instance:

first_appointment = Appointment.objects.first_appointment(appointment=appointment)

The next and previous appointment are relative to the schedule and a visit_code within that schedule. If next is called on the last appointment in the sequence None is returned. If previous is called on the first appointment in the sequence None is returned.

For example, in a sequence of appointment 1000, 2000, 3000, 4000:

>>> appointment.visit_code
1000
>>> next_appointment = Appointment.objects.next_appointment(appointment=appointment)
>>> next_appointment.visit_code
2000

But you can also pass an appointment instance and pass the visit code:

>>> appointment.visit_code
1000
>>> next_appointment = Appointment.objects.next_appointment(appointment=appointment, visit_code=3000)
>>> next_appointment.visit_code
4000

If you ask for the next appointment from the last, None is returned:

>>> appointment.visit_code
4000
>>> next_appointment = Appointment.objects.next_appointment(appointment=appointment, visit_code=3000)
>>> next_appointment.visit_code
AttributeError: 'NoneType' object has no attribute 'visit_code'

The previous_appointment acts as expected:

>>> appointment.visit_code
1000
>>> previous_appointment = Appointment.objects.previous_appointment(appointment=appointment)
>>> previous_appointment.visit_code
AttributeError: 'NoneType' object has no attribute 'visit_code'

This method will delete all appointments for a subject after a given datetime. See also edc-offstudy.

Appointment is usually a foreignkey of a visit model. It's important when using this method to ensure that when declaring Appointment as a foreignkey you explicitly set on_delete=PROTECT. If you don't, the deletion will cascade to other related instances -- and that's bad.

appointment = models.OneToOneField(Appointment, on_delete=PROTECT)