edc-visit-tracking 0.2.25

Base classes for visit reports/tracking in clinicedc/edc.

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edc-visit-tracking
------------------

Track study participant visit reports.


Declaring a visit model
+++++++++++++++++++++++

A **visit_model** is declared using the model mixin `VisitModelMixin`. Normally, a **visit_model** will be declared with additional model mixins, but `VisitModelMixin` must be there.


.. code-block:: python

class SubjectVisit(VisitModelMixin, BaseUuidModel):
...

Also, ensure the `Meta` class attributes of `VisitModelMixin` are inherited. These include required constraints and ordering.


.. code-block:: python

class SubjectVisit(VisitModelMixin, BaseUuidModel):

...

class Meta(VisitModelMixin.Meta):
pass

Among other features, `VisitModelMixin` adds a `OneToOneField` foreign key to the **visit_model** that points to `edc_appointment.Appointment`.

Important: A **visit model** is a special model in the EDC. A model declared with the model mixin, `VisitModelMixin`, is the definition of a **visit model**. CRFs and Requisitions have a foreign key pointing to a **visit model**. A number of methods on CRFs and Requisitions detect their **visit model** foreign key name, model class and value by looking for the FK declared with `VisitModelMixin`.


For a subject that requires ICF the **visit model** would look like this:

.. code-block:: python

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

class Meta(VisitModelMixin.Meta):
consent_model = 'myapp.subjectconsent' # for RequiresConsentModelMixin


If the subject does not require ICF, such as an infant, don't include the `RequiresConsentModelMixin`:

.. code-block:: python

class InfantVisit(VisitModelMixin, OffstudyMixin,
CreatesMetadataModelMixin, BaseUuidModel):

class Meta(VisitModelMixin.Meta):
pass

Declaring a CRF
+++++++++++++++

The `CrfModelMixin` is required for all CRF models. CRF models have a `OneToOneField` key to a **visit model**.

.. code-block:: python

class CrfOne(CrfModelMixin, OffstudyCrfModelMixin, RequiresConsentModelMixin,
UpdatesCrfMetadataModelMixin, BaseUuidModel):

subject_visit = models.OneToOneField(SubjectVisit)

f1 = models.CharField(max_length=10, default='erik')

vl = models.CharField(max_length=10, default=NO)

rdb = models.CharField(max_length=10, default=NO)

class Meta:
consent_model = 'myapp.subjectconsent' # for RequiresConsentModelMixin

Declaring forms:
+++++++++++++++
The `VisitFormMixin` includes a number of common validations in the `clean` method:

.. code-block:: python

class SubjectVisitForm(VisitFormMixin, forms.ModelForm):

class Meta:
model = SubjectVisit

`PreviousVisitModelMixin`
++++++++++++++++++++++++

The `PreviousVisitModelMixin` ensures that visits are entered in sequence. It is included with the `VisitModelMixin`.


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