Add fund index and fund page

opentech/publicpages/models.py

+from django.conf import settings
+from django.core.paginator import EmptyPage, PageNotAnInteger, Paginator
 from django.db import models
+from django.db.models.functions import Coalesce
 
-# Create your models here.
+from wagtail.wagtailadmin.edit_handlers import (
+    FieldPanel,
+    PageChooserPanel,
+    StreamFieldPanel,
+)
+from wagtail.wagtailcore.fields import StreamField
+
+from opentech.utils.blocks import StoryBlock
+from opentech.utils.models import BasePage
+
+
+class FundPage(BasePage):
+    subpage_types = []
+    parent_page_types = ['FundIndex']
+
+    introduction = models.TextField(blank=True)
+    fund_type = models.ForeignKey(
+        'wagtailcore.Page',
+        on_delete=models.SET_NULL,
+        related_name='+',
+    )
+    body = StreamField(StoryBlock())
+
+    content_panels = BasePage.content_panels + [
+        FieldPanel('introduction'),
+        PageChooserPanel('fund_type', 'apply.FundType'),
+        StreamFieldPanel('body'),
+    ]
+
+
+class NewsIndex(BasePage):
+    subpage_types = ['FundPage']
+    parent_page_types = ['home.HomePage']
+
+    def get_context(self, request, *args, **kwargs):
+        funds = FundPage.objects.live().public().descendant_of(self).annotate(
+            date=Coalesce('publication_date', 'first_published_at')
+        ).order_by('-date')
+
+        # Pagination
+        page = request.GET.get('page', 1)
+        paginator = Paginator(funds, settings.DEFAULT_PER_PAGE)
+        try:
+            news = paginator.page(page)
+        except PageNotAnInteger:
+            news = paginator.page(1)
+        except EmptyPage:
+            news = paginator.page(paginator.num_pages)
+
+        context = super().get_context(request, *args, **kwargs)
+        context.update(news=news)
+        return context