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couchdb nano upsert - fast and simple
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| // | |
| // async upsert( db, doc[, id] ) | |
| // | |
| // attempts to insert a document, on document conflict, attempt to create a new version | |
| // | |
| const upsert = (db, doc, id) => | |
| // attempt to insert the doucment "as is" | |
| db.insert(doc, id).catch(err => { | |
| // for anything other than a document conflict... | |
| if (err.statusCode !== 409) | |
| // ...re-throw the error. | |
| throw err; | |
| // get the document id from the parameter or the document itself | |
| const _id = id || doc._id; | |
| // use the head() function to grab the existing document's etag header | |
| return db.head(_id) | |
| .then(({ etag }) => { | |
| doc._id = _id; | |
| doc._rev = etag.replace(/"/g, ''); // strip extraneous '"'s | |
| return db.insert(doc); | |
| }) | |
| .catch(err => { | |
| throw err; // unexpected error from db.head() | |
| }); | |
| }); | |
| module.exports = upsert; |
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