feat: add fixed usd pricing course run level (#4392)

Author: AfaqShuaib09

course_discovery/apps/course_metadata/migrations/0344_courserun_fixed_price_usd_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.2.14 on 2024-07-26 11:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('course_metadata', '0343_alter_program_taxi_form'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='courserun',
+            name='fixed_price_usd',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='The fixed USD price for course runs to minimize the impact of currency fluctuations.', max_digits=10, null=True),
+        ),
+        migrations.AddField(
+            model_name='historicalcourserun',
+            name='fixed_price_usd',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='The fixed USD price for course runs to minimize the impact of currency fluctuations.', max_digits=10, null=True),
+        ),
+    ]

course_discovery/apps/course_metadata/models.py

@@ -2112,6 +2112,11 @@ class CourseRun(ManageHistoryMixin, DraftModelMixin, CachedMixin, TimeStampedMod
         (False, _('Unrestricted')),
     )
 
+    PRICE_FIELD_CONFIG = {
+        'decimal_places': 2,
+        'max_digits': 10,
+    }
+
     IN_REVIEW_STATUS = [CourseRunStatus.InternalReview, CourseRunStatus.LegalReview]
     POST_REVIEW_STATUS = [CourseRunStatus.Reviewed, CourseRunStatus.Published]
 
@@ -2230,6 +2235,11 @@ class CourseRun(ManageHistoryMixin, DraftModelMixin, CachedMixin, TimeStampedMod
         )
     )
 
+    fixed_price_usd = models.DecimalField(
+        **PRICE_FIELD_CONFIG, null=True, blank=True, editable=True,
+        help_text=('The fixed USD price for course runs to minimize the impact of currency fluctuations.')
+    )
+
     STATUS_CHANGE_EXEMPT_FIELDS = [
         'start',
         'end',

course_discovery/apps/course_metadata/tests/factories.py

@@ -481,6 +481,7 @@ class CourseRunFactory(SalesforceRecordFactory):
     enterprise_subscription_inclusion = False
     type = factory.SubFactory(CourseRunTypeFactory)
     variant_id = factory.LazyFunction(uuid4)
+    fixed_price_usd = FuzzyDecimal(0.0, 650.0)
 
     @factory.post_generation
     def staff(self, create, extracted, **kwargs):

course_discovery/apps/course_metadata/tests/test_models.py

@@ -942,6 +942,30 @@ def test_str(self):
         course_run = self.course_run
         assert str(course_run) == f'{course_run.key}: {course_run.title}'
 
+    def test_course_run_fixed_usd_price(self):
+        """
+        Verify that the course_run_fixed_usd_price attribute returns the correct fixed usd price for the course run.
+        """
+        ee_course_type = factories.CourseRunTypeFactory(slug=CourseRunType.UNPAID_EXECUTIVE_EDUCATION)
+
+        ee_course_run = factories.CourseRunFactory(
+            type=ee_course_type,
+            course=CourseFactory(additional_metadata=AdditionalMetadataFactory()),
+            fixed_price_usd=100
+        )
+        assert ee_course_run.fixed_price_usd == 100
+
+        ee_course_run = factories.CourseRunFactory(
+            type=ee_course_type,
+            course=CourseFactory(additional_metadata=AdditionalMetadataFactory()),
+        )
+        assert ee_course_run.fixed_price_usd >= 0
+
+        course_run = factories.CourseRunFactory(
+            fixed_price_usd=None
+        )
+        assert course_run.fixed_price_usd is None
+
     @ddt.data('full_description_override', 'outcome_override', 'short_description_override')
     def test_html_fields_are_validated(self, field_name):
         # Happy path