bugfix in prepareQuery for pouchdb

src/rx-storage-pouchdb.ts

@@ -160,14 +160,16 @@ export class RxStoragePouchDbClass implements RxStorage<PouchDBInstance> {
         const query = mutateableQuery;
 
         /**
-         * because sort wont work on unused keys we have to workarround
+         * because sort wont work on unused keys we have to workaround
          * so we add the key to the selector if necessary
          * @link https://github.com/nolanlawson/pouchdb-find/issues/204
          */
         if (query.sort) {
             query.sort.forEach(sortPart => {
                 const key = Object.keys(sortPart)[0];
-                if (!query.selector[key] || !query.selector[key].$gt) {
+                const comparisonOperators = ['$gt', '$gte', '$lt', '$lte'];
+                const keyUsed = query.selector[key] && Object.keys(query.selector[key]).some(op => comparisonOperators.includes(op)) || false;
+                if (!keyUsed) {
                     const schemaObj = rxQuery.collection.schema.getSchemaByObjectPath(key);
                     if (!schemaObj) {
                         throw newRxError('QU5', {

test/unit/bug-report.test.ts

@@ -37,7 +37,8 @@ describe('bug-report.test.js', () => {
                     minimum: 0,
                     maximum: 150
                 }
-            }
+            },
+            indexes: ['age'],
         };
 
         // generate a random database-name
@@ -64,6 +65,13 @@ describe('bug-report.test.js', () => {
             age: 56
         });
 
+        await collection.insert({
+            passportId: 'foobar2',
+            firstName: 'Bob2',
+            lastName: 'Kelso2',
+            age: 58
+        });
+
         /**
          * to simulate the event-propagation over multiple browser-tabs,
          * we create the same database again
@@ -82,16 +90,23 @@ describe('bug-report.test.js', () => {
 
         // find the document in the other tab
         const myDocument = await collectionInOtherTab
-            .findOne()
-            .where('firstName')
-            .eq('Bob')
+            .findOne({
+                selector: {
+                    age: {
+                        $gte: 57,
+                    },
+                },
+                sort: [{ age: 'asc' }]
+            })
             .exec();
 
+        console.log(myDocument);
+
         /*
          * assert things,
          * here your tests should fail to show that there is a bug
          */
-        assert.strictEqual(myDocument.age, 56);
+        assert.strictEqual(myDocument.age, 58);
 
         // you can also wait for events
         const emitted = [];