Add support to update the display layout of posts in collections

AUTHORS.rst

@@ -77,4 +77,5 @@ Source Contributors
 - Yash Chhabria `@Cyatos <https://github.com/Cyatos>`_
 - Justin Krejcha <justin@justinkrejcha.com> `@jkrejcha <https://github.com/jkrejcha>`_
 - Dio Brando `@isFakeAccount <https://github.com/isFakeAccount>`_
+- Josh Kim `@jsk56143 <https://github.com/jsk56143>`_
 - Add "Name <email (optional)> and github profile link" above this line.

CHANGES.rst

@@ -9,6 +9,8 @@ Unreleased
 **Added**
 
 - :meth:`.pin` to manage pinned submissions on the authenticated user's profile.
+- :meth:`.update_display_layout` to update the display layout of posts in a
+  :class:`.Collection`.
 
 **Changed**
 

praw/endpoints.py

@@ -26,6 +26,7 @@
     "collection_create":       "api/v1/collections/create_collection",
     "collection_delete":       "api/v1/collections/delete_collection",
     "collection_desc":         "api/v1/collections/update_collection_description",
+    "collection_layout":       "api/v1/collections/update_collection_display_layout",
     "collection_follow":       "api/v1/collections/follow_collection",
     "collection_remove_post":  "api/v1/collections/remove_post_in_collection",
     "collection_reorder":      "api/v1/collections/reorder_collection",

praw/models/reddit/collections.py

@@ -165,6 +165,31 @@ def update_description(self, description: str):
             data={"collection_id": self.collection_id, "description": description},
         )
 
+    def update_display_layout(self, display_layout: str):
+        """Update the collection's display layout.
+
+        :param display_layout: Either ``"TIMELINE"`` for events or discussions or
+            ``"GALLERY"`` for images or memes. Passing ``""`` or ``None`` will clear the
+            set layout and ``collection.display_layout`` will be ``None``, however, the
+            collection will appear on Reddit as if ``display_layout`` is set to
+            ``"TIMELINE"``.
+
+        Example usage:
+
+        .. code-block:: python
+
+            collection = reddit.subreddit("test").collections("some_uuid")
+            collection.mod.update_display_layout("GALLERY")
+
+        """
+        self._reddit.post(
+            API_PATH["collection_layout"],
+            data={
+                "collection_id": self.collection_id,
+                "display_layout": display_layout,
+            },
+        )
+
     def update_title(self, title: str):
         """Update the collection's title.
 
@@ -220,6 +245,7 @@ class Collection(RedditBase):
     ``collection_id``   The UUID of the collection.
     ``created_at_utc``  Time the collection was created, represented in `Unix Time`_.
     ``description``     The collection description.
+    ``display_layout``  The collection display layout.
     ``last_update_utc`` Time the collection was last updated, represented in `Unix
                         Time`_.
     ``link_ids``        A ``list`` of :class:`.Submission` fullnames.

tests/integration/models/reddit/test_collections.py

@@ -4,7 +4,7 @@
 
 import pytest
 
-from praw.exceptions import ClientException
+from praw.exceptions import ClientException, RedditAPIException
 from praw.models import Submission
 
 from ... import IntegrationTest
@@ -138,6 +138,68 @@ def test_update_description(self, _):
             collection.mod.update_description(new_description)
             assert new_description == collection.description
 
+    @mock.patch("time.sleep", return_value=None)
+    def test_update_display_layout__empty_string(self, _):
+        self.reddit.read_only = False
+        uuid = "accd53cf-6f76-49fd-8ca5-5ad2036b4693"
+        empty_string = ""
+        with self.use_cassette():
+            collection = self.subreddit.collections(uuid)
+            collection.mod.update_display_layout(empty_string)
+            assert empty_string != collection.display_layout
+            assert collection.display_layout is None
+
+    @mock.patch("time.sleep", return_value=None)
+    def test_update_display_layout__gallery(self, _):
+        self.reddit.read_only = False
+        uuid = "accd53cf-6f76-49fd-8ca5-5ad2036b4693"
+        gallery_layout = "GALLERY"
+        with self.use_cassette():
+            collection = self.subreddit.collections(uuid)
+            collection.mod.update_display_layout(gallery_layout)
+            assert gallery_layout == collection.display_layout
+
+    @mock.patch("time.sleep", return_value=None)
+    def test_update_display_layout__invalid_layout(self, _):
+        self.reddit.read_only = False
+        uuid = "accd53cf-6f76-49fd-8ca5-5ad2036b4693"
+        invalid_layout = "colossal atom cake"
+        with self.use_cassette():
+            collection = self.subreddit.collections(uuid)
+            with pytest.raises(RedditAPIException):
+                collection.mod.update_display_layout(invalid_layout)
+            assert collection.display_layout is None
+
+    @mock.patch("time.sleep", return_value=None)
+    def test_update_display_layout__lowercase(self, _):
+        self.reddit.read_only = False
+        uuid = "accd53cf-6f76-49fd-8ca5-5ad2036b4693"
+        lowercase_gallery_layout = "gallery"
+        with self.use_cassette():
+            collection = self.subreddit.collections(uuid)
+            with pytest.raises(RedditAPIException):
+                collection.mod.update_display_layout(lowercase_gallery_layout)
+            assert collection.display_layout is None
+
+    @mock.patch("time.sleep", return_value=None)
+    def test_update_display_layout__none(self, _):
+        self.reddit.read_only = False
+        uuid = "accd53cf-6f76-49fd-8ca5-5ad2036b4693"
+        with self.use_cassette():
+            collection = self.subreddit.collections(uuid)
+            collection.mod.update_display_layout(None)
+            assert collection.display_layout is None
+
+    @mock.patch("time.sleep", return_value=None)
+    def test_update_display_layout__timeline(self, _):
+        self.reddit.read_only = False
+        uuid = "accd53cf-6f76-49fd-8ca5-5ad2036b4693"
+        timeline_layout = "TIMELINE"
+        with self.use_cassette():
+            collection = self.subreddit.collections(uuid)
+            collection.mod.update_display_layout(timeline_layout)
+            assert timeline_layout == collection.display_layout
+
     @mock.patch("time.sleep", return_value=None)
     def test_update_title(self, _):
         self.reddit.read_only = False