project listing filter "posted in or after YEAR" (posted since...)

not super-useful as long as can't change sorting, and default is to
sort by posting date anyway; but, a start!

resolves #36

src/marketplace/domain/proj.py

@@ -48,6 +48,7 @@ def list_public_projects(projname=None,
                          orgname=None,
                          skills=None,
                          social_cause=None,
+                         posted_since=None,
                          project_status=None):
     # We could also add the projects that are non-public but that also belong
     # to the organizations that the user is member of. Should that be added
@@ -60,6 +61,12 @@ def list_public_projects(projname=None,
     if orgname:
         projects = projects.filter(organization__name__icontains=orgname)
 
+    if isinstance(posted_since, int):
+        projects = projects.filter(creation_date__year__gte=posted_since)
+    elif posted_since:
+        # must be datetime-like value
+        projects = projects.filter(creation_date__gte=posted_since)
+
     if skills:
         for skill in re.split(r'[,\s]+', skills):
             projects = projects.filter(projecttask__projecttaskrequirement__skill__name__icontains=skill)

src/marketplace/templates/marketplace/components/filter_checkbox.html

@@ -1,10 +1,7 @@
-
-
-
 <div class="form-check">
   <label class="form-check-label" for="{{ field_name }}{{ field_value }}">
     <input class="form-check-input"
-           type="checkbox"
+           type="{{ field_type|default:'checkbox' }}"
            id="{{ field_name }}{{ field_value }}"
            name="{{ field_name }}"
            value="{{ field_value }}"

src/marketplace/templates/marketplace/proj_list.html

@@ -36,6 +36,14 @@ <h4>Filter results</h4>
           {% include 'marketplace/components/filter_checkbox.html' with field_name='projectstatus' field_value='completed' field_text='Completed' is_checked=checked_project_fields.completed %}
         </fieldset>
 
+        <fieldset class="mt-3" name="since">
+          <legend>Posted in or after</legend>
+          {# if we make form auto-submit on change, then these should perhaps be anchors. however, as currently implemented, radios perhaps make most sense. #}
+          {% for project_year, is_checked in project_years %}
+          {% include 'marketplace/components/filter_checkbox.html' with field_name='postedsince' field_value=project_year field_text=project_year field_type='radio' is_checked=is_checked %}
+          {% endfor %}
+        </fieldset>
+
         <button type="submit"
                 form="projlist"
                 formmethod="get"

src/marketplace/views/proj.py

@@ -5,6 +5,8 @@
 from django.contrib.messages.views import SuccessMessageMixin
 from django.contrib import messages
 from django.core.exceptions import ValidationError
+from django.db.models import Max, Min
+from django.db.models.functions import ExtractYear
 from django.forms import CharField, ModelForm, Textarea
 from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import redirect, render
@@ -135,15 +137,36 @@ def get_project_role(request, proj_pk, role_pk):
 
 @require_GET
 def project_list_view(request):
+    # year of posting filter gets slight special handling
+    (latest_year, oldest_year) = (
+        Project.objects
+        .annotate(
+            creation_year=ExtractYear('creation_date'),
+        ).aggregate(
+            Max('creation_year'),
+            Min('creation_year'),
+        ).values()
+    )
+    project_years = range(latest_year, (oldest_year - 1), -1)
+
+    try:
+        filter_year = int(request.GET.get('postedsince', ''))
+    except ValueError:
+        filter_year = None
+    selected_year = filter_year if filter_year in project_years else oldest_year
+
+    search_config = {'posted_since': selected_year}
+
+    # the rest are handled in bulk
     search_values = (
         request.GET.get(key.replace('_', ''))
         for key in PROJECT_SEARCH_KEYS
     )
-    search_config = {
-        key: value
+    search_config.update(
+        (key, value)
         for (key, value) in zip(PROJECT_SEARCH_KEYS, search_values)
         if value
-    }
+    )
 
     filter_projname = request.GET.get('projname', '')
     filter_orgname = request.GET.get('orgname', '')
@@ -186,6 +209,10 @@ def project_list_view(request):
         'user_is_any_organization_member': any_org_member,
         'single_org_membership': single_org_membership,
         'organization_memberships': organization_memberships,
+        'project_years': [
+            (project_year, project_year == selected_year)
+            for project_year in project_years
+        ],
     })