0.5.9 documentation prev and next article navigation

DocsApp/models.py

@@ -43,6 +43,63 @@ class DocArt(BaseModelViewPage):
         related_name='rel_docArts_for_version'
     )
 
+    def get_last_child(self):
+        return self.rel_childArts_for_docArt.filter(enable=True).order_by('-order').first()
+
+    def get_first_child(self):
+        return self.rel_childArts_for_docArt.filter(enable=True).order_by('order').first()
+
+    def get_last_version(self):
+        return self.versions.all().order_by('-order').first()
+
+    def get_children(self, version):
+        return self.rel_childArts_for_docArt.filter(enable=True)
+
+
+    def get_prev_article(self, version=None):
+        if not version:
+            version = self.get_last_version()
+
+        art = DocArt.objects.filter(
+            enable=True,
+            versions=version,
+            order__lt=self.order,
+            parent=self.parent
+        ).order_by('-order').first()
+
+        if art:
+            while art.get_last_child():
+                art = art.get_last_child()
+
+        if not art and self.parent:
+            art = self.parent
+
+        return art
+
+
+    def get_next_article(self, version=None):
+        if not version:
+            version = self.get_last_version()
+
+        art = self.get_first_child()
+        if not art:
+            art = DocArt.objects.filter(
+                enable=True,
+                versions=version,
+                order__gt=self.order,
+                parent=self.parent
+            ).order_by('order').first()
+
+        if not art and self.parent:
+            art = DocArt.objects.filter(
+                enable=True,
+                versions=version,
+                order__gt=self.parent.order,
+                parent=self.parent.parent
+            ).order_by('order').first()
+
+        return art
+
     def get_parents_path(self, version_obj=None):
 
         res = []