P5-802 add pagination

api/models/category.py

@@ -23,15 +23,12 @@ class Category(db.Model):
         path = slugify(path)
         return path
 
-    def to_json(self, nested=False):
-        j = {
+    def to_json(self):
+        return {
             'id': self.id,
-            'name': self.name
+            'name': self.name,
+            'texts': [t.to_json() for t in self.texts]
         }
-        if nested:
-            j['texts'] = [t.to_json() for t in self.texts]
-
-        return j
 
 
 class CategoryTexts(db.Model):