cradle / JSON.stringify / typeError

gistfile1.txt

{ stack: 'TypeError: Converting circular structure to JSON\n
		at Object.stringify (native)\n    
		at Connection.cradle.Connection.request (/tmp/winston-couchdb/node_modules/cradle/lib/cradle.js:182:29)\n    JSON.stringify ( blammo :( )
		atDatabase.query (/tmp/winston-couchdb/node_modules/cradle/lib/cradle/database/index.js:15:21)\n    Database.prototype.query -> this.connection.request( options, callback )
		at Database.post (/tmp/winston-couchdb/node_modules/cradle/lib/cradle/database/documents.js:71:10)\n    Database.prototype.post 
		at Database._save (/tmp/winston-couchdb/node_modules/cradle/lib/cradle/database/documents.js:150:18)\n    POST
		at Database.save (/tmp/winston-couchdb/node_modules/cradle/lib/cradle/database/documents.js:92:10)\n    _save
		at Couchdb.log (/tmp/winston-couchdb/lib/winston-couchdb.js:91:15)\n    
		at Object.helpers.testLevels.circmetadatatest.topic (/tmp/winston-couchdb/node_modules/winston/test/helpers.js:165:17)\n    
		at run (/usr/local/lib/node_modules/vows/lib/vows/suite.js:134:35)\n    
		at EventEmitter.Suite.runBatch.callback (/usr/local/lib/node_modules/vows/lib/vows/suite.js:234:40)', 
		type: 'circular_structure', arguments: [], message: 'Converting circular structure to JSON' } // cradle.js:182

solution : import cycle

in winston-couchdb.js, change :

var params = meta || {}; to
var params = cycle.decycle(meta) || {};