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adding filter usage in the example #4

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adding filter usage in the example #4

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16 changes: 16 additions & 0 deletions README.md
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Expand Up @@ -265,6 +265,22 @@ data=events)

In the email template `risky_toaster_template.html` we can do more grouping or sorting, assuming that one toaster owner is responsible for several toasters. For example alerts can be sorted by location or grouped by new/old status, first presenting all newly discovered risky toasters, and then having a reminder list about the still open issues for toasters that have been reported before but are not fixed yet.

### Filter

You can use our filter decorator as well, in cases you would want to filter messages by defined conditions before saving them into the DB.

In our example we assume that we have a filter function which includes filtering events only if their owner is one of our alpha customers, which we define in a different config file.

```python
@APP.register_filter('riskytoaster')
def filter(event):
event_owner = event['owner']
if event_owner in config.ALPHA_CUSTOMERS:
return event
return None
```

If the owner is not one of our alpha customers, we return None so that later the event won't be saved into the database.

# Code of Conduct

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