feat: added cohort and subgroup pages

Issue #271

school/www/cohorts/subgroup.py

@@ -0,0 +1,33 @@
+import frappe
+from . import utils
+
+def get_context(context):
+    context.no_cache = 1
+    course = utils.get_course()
+    if frappe.session.user == "Guest":
+        frappe.local.flags.redirect_location = "/login?redirect-to=" + frappe.request.path
+        raise frappe.Redirect()
+
+    cohort = utils.get_cohort(course, frappe.form_dict['cohort'])
+    subgroup = utils.get_subgroup(cohort, frappe.form_dict['subgroup'])
+
+    if not subgroup:
+        context.template = "www/404.html"
+        return
+
+    utils.add_nav(context, "All Courses", "/courses")
+    utils.add_nav(context, course.title, f"/courses/{course.name}")
+    utils.add_nav(context, "Cohorts", f"/courses/{course.name}/cohorts")
+    utils.add_nav(context, cohort.title, f"/courses/{course.name}/cohorts/{cohort.slug}")
+
+    context.course = course
+    context.cohort = cohort
+    context.subgroup = subgroup
+    context.stats = get_stats(subgroup)
+    context.page = frappe.form_dict["page"]
+
+def get_stats(subgroup):
+    return {
+        "join_requests": len(subgroup.get_join_requests()),
+        "students": len(subgroup.get_students())
+    }