correctly dispose cached models

app/assets/javascripts/ide/stores/actions/file.js

@@ -156,7 +156,7 @@ export const setFileViewMode = ({ state, commit }, { file, viewMode }) => {
   commit(types.SET_FILE_VIEWMODE, { file, viewMode });
 };
 
-export const discardFileChanges = ({ state, commit }, path) => {
+export const discardFileChanges = ({ dispatch, state, commit, getters }, path) => {
   const file = state.entries[path];
 
   commit(types.DISCARD_FILE_CHANGES, path);
@@ -164,9 +164,18 @@ export const discardFileChanges = ({ state, commit }, path) => {
 
   if (file.tempFile && file.opened) {
     commit(types.TOGGLE_FILE_OPEN, path);
+  } else if (getters.activeFile && file.path === getters.activeFile.path) {
+    dispatch('updateDelayViewerUpdated', true)
+      .then(() => {
+        router.push(`/project${file.url}`);
+      })
+      .catch(e => {
+        throw e;
+      });
   }
 
   eventHub.$emit(`editor.update.model.new.content.${file.key}`, file.content);
+  eventHub.$emit(`editor.update.model.dispose.unstaged-${file.key}`, file.content);
 };
 
 export const stageChange = ({ commit, state }, path) => {

spec/javascripts/ide/stores/actions/file_spec.js

@@ -405,6 +405,7 @@ describe('IDE store file actions', () => {
 
     beforeEach(() => {
       spyOn(eventHub, '$on');
+      spyOn(eventHub, '$emit');
 
       tmpFile = file();
       tmpFile.content = 'testing';
@@ -463,6 +464,31 @@ describe('IDE store file actions', () => {
         })
         .catch(done.fail);
     });
+
+    it('pushes route for active file', done => {
+      tmpFile.active = true;
+      store.state.openFiles.push(tmpFile);
+
+      store
+        .dispatch('discardFileChanges', tmpFile.path)
+        .then(() => {
+          expect(router.push).toHaveBeenCalledWith(`/project${tmpFile.url}`);
+
+          done();
+        })
+        .catch(done.fail);
+    });
+
+    it('emits eventHub event to dispose cached model', done => {
+      store
+        .dispatch('discardFileChanges', tmpFile.path)
+        .then(() => {
+          expect(eventHub.$emit).toHaveBeenCalled();
+
+          done();
+        })
+        .catch(done.fail);
+    });
   });
 
   describe('stageChange', () => {