Add assignment date range.

www/conservancy/apps/assignment/models.py

@@ -4,6 +4,8 @@ from django.db import models
 
 
 class Assignment(models.Model):
+    """A copyright assignment to Conservancy."""
+
     full_name = models.CharField(max_length=255)
     email = models.EmailField()
     place_of_residence = models.TextField(
@@ -20,9 +22,12 @@ class Assignment(models.Model):
         choices=[
             ('up to this year', 'One-off up to and including this year'),
             ('ongoing', 'All existing and new contributions'),
+            ('specific', 'A specific period (details below)'),
         ],
         default='up to this year',
     )
+    coverage_from = models.DateField(blank=True)
+    coverage_to = models.DateField(blank=True)
     attestation_of_copyright = models.BooleanField(
         'I attest that I own the copyright on these works'
     )

www/conservancy/apps/assignment/views.py

@@ -1,13 +1,21 @@
-from django.shortcuts import render
-
+from django import forms
 from django.urls import reverse_lazy
 from django.views.generic import TemplateView
 from django.views.generic.edit import CreateView
+
 from .models import Assignment
 
 
-class AssignmentCreateView(CreateView):
+class AssignmentForm(forms.ModelForm):
     model = Assignment
+    coverage_from = forms.DateField(required=False)
+    coverage_to = forms.DateField(required=False)
+
+
+class AssignmentCreateView(CreateView):
+    """Show a form for the initial  copyright assignment."""
+
+    form_class = AssignmentForm
     fields = [
         'full_name',
         'email',

www/conservancy/templates/assignment/assignment_form.html

@@ -33,6 +33,6 @@
 
     <p><em>Please be aware that some employment agreements explicitly transfer copyright ownership to the employer. We recommend you review your recent employment agreements for such clauses.</em></p>
 
-    <p><button type="submit" class="ph3 pv2">Next</button>
+    <p><button type="submit" class="ph3 pv2">Next</button></p>
   </form>
 {% endblock %}