Re: [PR] Restore the ability to return error object from maps [couchdb]

[via GitHub]

nickva commented on PR #5431:
URL: https://github.com/apache/couchdb/pull/5431#issuecomment-2660206501

   Playing around with an older python view script:
   
   ```python
   #!/usr/bin/env python3
   #
   # pip install CouchDB
   #
   # ./dev/run --admin=adm:pass -n 1
   # ./view_with_error.py
   
   import sys, couchdb
   
   URL='http://adm:pass@localhost:15984'
   DB = 'db'
   
   MAP_FUN = '''
   function(doc){
     try{
       emit(doc.data.v, doc._id)
     } catch(e) {
       emit(["error", doc._id], e)
     }
   }'''
   
   def add_view(db, docid):
       db[docid] = {
           "views": {
               "v1": {"map": MAP_FUN}
           }
       }
   
   def main(dbname):
       s = couchdb.Server(URL)
       if dbname in set(s):
           s.delete(dbname)
       db = s.create(dbname)
       add_view(db, docid='_design/ddoc')
       db.update([
           {'_id':'doc1', 'data':{'v':42}},
           {'_id':'doc2', 'sorry':'no_data_here'},
           {'_id':'doc3', 'data':{'v':43}},
       ])
       for r in db.view('ddoc/v1'):
           print(r)
   
   if __name__=='__main__':
       main(DB)
   ```
   
   ```
   ./view_with_error.py
   <Row id='doc1', key=42, value='doc1'>
   <Row id='doc3', key=43, value='doc3'>
   <Row id='doc2', key=['error', 'doc2'], value={'error': 'TypeError', 
'message': 'doc.data is undefined'}>
   ```


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