[GitHub] bolkedebruin commented on issue #3604: Mapbox Visualizatuion error cause by "is not JSON serializable"

[GitBox]

bolkedebruin commented on issue #3604: Mapbox Visualizatuion error cause by "is 
not JSON serializable"
URL: 
https://github.com/apache/incubator-superset/issues/3604#issuecomment-351935364
 
 
   ```
   
   from superset.connectors.druid.models import DruidMetric
   import json
   from superset.utils import base_json_conv
   
   m = DruidMetric()
   json.dumps(m, default=base_json_conv)
   
   'null'
   
   ```
   
   DruidMetric just needs a `default` method from JSONEncoder.

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