Add a few tips on URL naming #15

django.md

@@ -11,7 +11,7 @@ cookiecutter [email protected]:makimo/django-template.git
 ### Templates
 
 Nobody cares whether HTML in the browser is indented nicely or not. So the
-focus shifts to make templates programmer-friendly, treating logical blocks 
+focus shifts to make templates programmer-friendly, treating logical blocks
 and HTML elements as first-class citizens for legibility.
 
 ```
@@ -31,3 +31,50 @@ and HTML elements as first-class citizens for legibility.
 ```
 
 Note: You can omit indentation after global scope `{% block %}` elements.
+
+### URL Naming
+
+Here are some tips for creating readable URL resource structure.
+
+#### 1. Path Params vs. Query Strings
+
+Use path params to locate the resource and query strings to parametrize
+the query.
+
+```python
+def get(self, request, object_id):
+    option = self.request.GET.get('option', 'default')
+```
+
+#### 2. Plural vs. Singular
+
+Use plural form to indicate the fact that a resource is a list. Use
+singular if object returned is a singleton.
+
+```
+/users
+/users/{id}/config
+```
+
+#### 3. Nesting Resources
+
+A good rule of thumb regarding resource resting is to nest resources if
+a child candidate resources cannot exist outside of its parent. Otherwise
+we may end up with multiple paths refering to the same resource.
+
+```
+/users/{user_id}/config
+/user-configs?user_id={user_id}
+/user-configs/{user_id}
+/configs?type=user-configs&cfg_id={cfg_id}
+```
+
+This is very ugly.
+
+Of course, it _may_ be more convienient and readable to break this rule.
+In such case, ensure that nesting is done only on strong relations.
+
+```
+/author/{author_id}/books
+/books/{book_id}
+```