fix(read) Fix READ after a delete operation, document through tests

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ladda-cache",
-  "version": "0.2.11",
+  "version": "0.2.12",
   "description": "Data fetching layer with support for caching",
   "main": "dist/bundle.js",
   "dependencies": {

src/builder.spec.js

@@ -122,11 +122,52 @@ describe('builder', () => {
 
     Promise.resolve()
       .then(() => api.user.getUsers())
-      .then(() => api.user.deleteUser(1))
+      .then(() => api.user.deleteUser('1'))
       .then(() => api.user.getUsers())
       .then(expectUserToBeRemoved);
   });
 
+  describe('after deletion', () => {
+    it('calls the apiFn again when marked as byId === true', () => {
+      const myConfig = config();
+      const spy = sinon.spy();
+
+      const getUserById = () => {
+        spy();
+        return Promise.resolve({ id: 4 });
+      };
+      getUserById.operation = 'READ';
+      getUserById.byId = true;
+
+      myConfig.user.api.getUserById = getUserById;
+
+      const api = build(myConfig);
+
+      return Promise.resolve()
+        .then(() => api.user.getUserById('1'))
+        .then(() => api.user.deleteUser('1'))
+        .then(() => api.user.getUserById('1'))
+        .then(() => {
+          expect(spy).to.have.been.calledTwice;
+        });
+    });
+
+    it('returns null for normal read operation when entity is requested again', () => {
+      const myConfig = config();
+
+      const api = build(myConfig);
+
+      return Promise.resolve()
+        .then(() => api.user.getUser('1'))
+        .then(() => api.user.deleteUser('1'))
+        .then(() => api.user.getUser('1'))
+        .then((user) => {
+          expect(user).to.be.null;
+        });
+    });
+  });
+
+
   it('TTL set to zero means we never get a cache hit', (done) => {
     const myConfig = config();
     myConfig.user.ttl = 0;

src/plugins/cache/operations/read.js

@@ -61,7 +61,7 @@ const decorateReadQuery = (c, cache, notify, e, aFn) => {
     if (Cache.containsQueryResponse(cache, e, aFn, args) && !aFn.alwaysGetFreshData) {
       const v = Cache.getQueryResponseWithMeta(cache, c, e, aFn, args);
       if (!Cache.hasExpired(cache, e, v)) {
-        return Promise.resolve(removeId(Cache.getQueryResponse(v.value)));
+        return Promise.resolve(v.value ? removeId(Cache.getQueryResponse(v.value)) : null);
       }
     }