Added `delete_job` argument to registry.remove()` (#1161)

docs/docs/job_registries.md

@@ -7,7 +7,7 @@ Each queue maintains a set of Job Registries:
 * `StartedJobRegistry` Holds currently executing jobs. Jobs are added right before they are 
 executed and removed right after completion (success or failure).
 * `FinishedJobRegistry` Holds successfully completed jobs.
-* `FailedJobRegistry` Holds jobs that have failed.
+* `FailedJobRegistry` Holds jobs that have been executed, but didn't finish successfully.
 * `DeferredJobRegistry` Holds deferred jobs (jobs that depend on another job and are waiting for that 
 job to finish).
 
@@ -20,15 +20,15 @@ from rq import Queue
 from rq.registry import StartedJobRegistry
 from somewhere import count_words_at_url
 
-conn = Redis()
-queue = Queue(connection=conn)
+redis = Redis()
+queue = Queue(connection=redis)
 job = queue.enqueue(count_words_at_url, 'http://nvie.com')
 
 # get StartedJobRegistry by queue
 registry = StartedJobRegistry(queue=queue)
 
 # or get StartedJobRegistry by queue name and connection
-registry2 = StartedJobRegistry(name='my_queue', connection=conn)
+registry2 = StartedJobRegistry(name='my_queue', connection=redis)
 
 # sleep for a moment while job is taken off the queue
 time.sleep(0.1)
@@ -42,4 +42,30 @@ print('IDs in registry %s' % registry.get_job_ids())
 # test if a job is in the registry using the job instance or job id
 print('Job in registry %s' % (job in registry))
 print('Job in registry %s' % (job.id in registry))
+```
+
+## Removing Jobs
+
+To remove a job from a job registry, use `registry.remove()`. This is useful
+when you want to manually remove jobs from a registry, such as deleting failed
+jobs before they expire from `FailedJobRegistry`.
+
+```python
+from redis import Redis
+from rq import Queue
+from rq.registry import FailedJobRegistry
+
+redis = Redis()
+queue = Queue(connection=redis)
+registry = FailedJobRegistry(queue=queue)
+
+# This is how to remove a job from a registry
+for job_id in registry.get_job_ids():
+    registry.remove(job_id)
+
+# If you want to remove a job from a registry AND delete the job,
+# use `delete_job=True`
+for job_id in registry.get_job_ids():
+    registry.remove(job_id, delete_job=True)
+
 ```

rq/registry.py

@@ -58,9 +58,18 @@ class BaseRegistry(object):
 
         return self.connection.zadd(self.key, {job.id: score})
 
-    def remove(self, job, pipeline=None):
+    def remove(self, job, pipeline=None, delete_job=False):
+        """Removes job from registry and deletes it if `delete_job == True`"""
         connection = pipeline if pipeline is not None else self.connection
-        return connection.zrem(self.key, job.id)
+        job_id = job.id if isinstance(job, self.job_class) else job
+        result = connection.zrem(self.key, job_id)
+        if delete_job:
+            if isinstance(job, self.job_class):
+                job_instance = job
+            else:
+                job_instance = Job.fetch(job_id, connection=connection)
+            job_instance.delete()
+        return result
 
     def get_expired_job_ids(self, timestamp=None):
         """Returns job ids whose score are less than current timestamp.

tests/test_registry.py

@@ -60,7 +60,9 @@ class TestRegistry(RQTestCase):
     def test_add_and_remove(self):
         """Adding and removing job to StartedJobRegistry."""
         timestamp = current_timestamp()
-        job = Job()
+
+        queue = Queue(connection=self.testconn)
+        job = queue.enqueue(say_hello)
 
         # Test that job is added with the right score
         self.registry.add(job, 1000)
@@ -71,9 +73,33 @@ class TestRegistry(RQTestCase):
         self.registry.add(job, -1)
         self.assertEqual(self.testconn.zscore(self.registry.key, job.id), float('inf'))
 
-        # Ensure that job is properly removed from sorted set
+        # Ensure that job is removed from sorted set, but job key is not deleted
         self.registry.remove(job)
         self.assertIsNone(self.testconn.zscore(self.registry.key, job.id))
+        self.assertTrue(self.testconn.exists(job.key))
+
+        self.registry.add(job, -1)
+
+        # registry.remove() also accepts job.id
+        self.registry.remove(job.id)
+        self.assertIsNone(self.testconn.zscore(self.registry.key, job.id))
+
+        self.registry.add(job, -1)
+
+        # delete_job = True deletes job key
+        self.registry.remove(job, delete_job=True)
+        self.assertIsNone(self.testconn.zscore(self.registry.key, job.id))
+        self.assertFalse(self.testconn.exists(job.key))
+
+        job = queue.enqueue(say_hello)
+
+        self.registry.add(job, -1)
+
+        # delete_job = True also works with job.id
+        self.registry.remove(job.id, delete_job=True)
+        self.assertIsNone(self.testconn.zscore(self.registry.key, job.id))
+        self.assertFalse(self.testconn.exists(job.key))
+
 
     def test_get_job_ids(self):
         """Getting job ids from StartedJobRegistry."""