garbados opened a new pull request #1898: [wip] feat: add mango-based VDU 
endpoints
URL: https://github.com/apache/couchdb/pull/1898
 
 
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   ## Overview
   
   This work-in-progress PR tracks my efforts to implement features described 
in https://github.com/apache/couchdb/issues/1554 namely Mango-based update 
handlers under the `/{db}/_update` endpoint.
   
   As of this writing, I have scaffolded only a few functions and have written 
no tests. I'm mainly fumbling around, copying code from where it seems to make 
sense, in anticipation of further guidance.
   
   As described in the issue thread, this PR attempts to implement the 
following endpoints:
   - `GET /{db/_update`: Retrieve a database's update handlers, similar to `GET 
/{db}/_index`.
   - `POST /{db}/_update`: Submit a document for validation. If it passes 
validation, the update is accepted. Otherwise, it is rejected.
   - `PUT /{db}/_update`: Create a new update handler.
   - `DELETE /{db}/_update`: Delete an update handler.
   
   Although not yet in the code, I expect update handlers to have at least two 
attributes: a `guard` selector, which indicates which documents this handler 
applies to; and a `condition` selector, which validates the document. If a 
document passes the `guard` selector but not the `condition` selector, it is 
rejected. If a document submitted for validation matches no known guard 
selectors, it should be rejected too.
   
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        what problem it solves or how it makes things better. -->
   
   ## Testing recommendations
   
   As of this writing, there are no tests in this PR.
   
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   ## Related Issues or Pull Requests
   
   - https://github.com/apache/couchdb/issues/1554
   
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   ## Checklist
   
   - [ ] Code is written and works correctly;
   - [ ] Changes are covered by tests;
   - [ ] Documentation reflects the changes;
   

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