Search: fix crash on paginating hashtags

app/soapbox/reducers/__tests__/search-test.js

@@ -1,8 +1,9 @@
-import { Map as ImmutableMap } from 'immutable';
+import { Map as ImmutableMap, List as ImmutableList, fromJS } from 'immutable';
 
 import {
   SEARCH_CHANGE,
   SEARCH_CLEAR,
+  SEARCH_EXPAND_SUCCESS,
 } from 'soapbox/actions/search';
 
 import reducer from '../search';
@@ -52,4 +53,53 @@ describe('search reducer', () => {
       expect(reducer(state, action)).toEqual(expected);
     });
   });
+
+  describe(SEARCH_EXPAND_SUCCESS, () => {
+    it('imports hashtags as maps', () => {
+      const state = ImmutableMap({
+        value: 'artist',
+        submitted: true,
+        submittedValue: 'artist',
+        hidden: false,
+        results: ImmutableMap({
+          hashtags: ImmutableList(),
+        }),
+        filter: 'hashtags',
+      });
+
+      const action = {
+        type: SEARCH_EXPAND_SUCCESS,
+        results: {
+          accounts: [],
+          statuses: [],
+          hashtags: [{
+            name: 'artist',
+            url: 'https://gleasonator.com/tags/artist',
+            history: [],
+          }],
+        },
+        searchTerm: 'artist',
+        searchType: 'hashtags',
+      };
+
+      const expected = ImmutableMap({
+        value: 'artist',
+        submitted: true,
+        submittedValue: 'artist',
+        hidden: false,
+        results: ImmutableMap({
+          hashtags: fromJS([{
+            name: 'artist',
+            url: 'https://gleasonator.com/tags/artist',
+            history: [],
+          }]),
+          hashtagsHasMore: false,
+          hashtagsLoaded: true,
+        }),
+        filter: 'hashtags',
+      });
+
+      expect(reducer(state, action)).toEqual(expected);
+    });
+  });
 });

app/soapbox/reducers/search.js

@@ -55,7 +55,15 @@ const paginateResults = (state, searchType, results, searchTerm) => {
     if (state.get('value') === searchTerm) {
       state.setIn(['results', `${searchType}HasMore`], results[searchType].length >= 20);
       state.setIn(['results', `${searchType}Loaded`], true);
-      state.updateIn(['results', searchType], items => items.concat(results[searchType].map(item => item.id)));
+      state.updateIn(['results', searchType], items => {
+        const data = results[searchType];
+        // Hashtags are a list of maps. Others are IDs.
+        if (searchType === 'hashtags') {
+          return items.concat(fromJS(data));
+        } else {
+          return items.concat(toIds(data));
+        }
+      });
     }
   });
 };