fix(netlify-cms-core): avoid partially loaded collection list (#1964)

packages/netlify-cms-core/src/reducers/__tests__/entries.spec.js

@@ -42,4 +42,23 @@ describe('entries', () => {
       ),
     );
   });
+
+  it('should handle loaded entry', () => {
+    const entry = { slug: 'a', path: '' };
+    expect(reducer(initialState, actions.entryLoaded(Map({ name: 'posts' }), entry))).toEqual(
+      OrderedMap(
+        fromJS({
+          posts: { name: 'posts' },
+          entities: {
+            'posts.a': { slug: 'a', path: '' },
+          },
+          pages: {
+            posts: {
+              ids: ['a'],
+            },
+          },
+        }),
+      ),
+    );
+  });
 });

packages/netlify-cms-core/src/reducers/entries.js

@@ -15,6 +15,7 @@ let collection;
 let loadedEntries;
 let append;
 let page;
+let slug;
 
 const entries = (state = Map({ entities: Map(), pages: Map() }), action) => {
   switch (action.type) {
@@ -25,10 +26,15 @@ const entries = (state = Map({ entities: Map(), pages: Map() }), action) => {
       );
 
     case ENTRY_SUCCESS:
-      return state.setIn(
-        ['entities', `${action.payload.collection}.${action.payload.entry.slug}`],
-        fromJS(action.payload.entry),
-      );
+      collection = action.payload.collection;
+      slug = action.payload.entry.slug;
+      return state.withMutations(map => {
+        map.setIn(['entities', `${collection}.${slug}`], fromJS(action.payload.entry));
+        const ids = map.getIn(['pages', collection, 'ids'], List());
+        if (!ids.includes(slug)) {
+          map.setIn(['pages', collection, 'ids'], ids.unshift(slug));
+        }
+      });
 
     case ENTRIES_REQUEST:
       return state.setIn(['pages', action.payload.collection, 'isFetching'], true);