javascript - Mongoose - use a post method to create a new empty collection -

libraries in use: express, mongoose, express-restify-mongoose

problem: trying figure out how create post request provide schema in req.body. want create new collection if not exist , enforce new schema.

when use following code:

app.use('/api/v1', function(req, res, next) {   if(req.path[0] === '/' && -1 === req.path.indexof('/', 1) && req.method === 'post') {     var collection_name = req.path.substr(1, req.path.length - 1).tolowercase();     if(mongoose.modelnames().indexof(collection_name) === -1) {       // create if model not exist       console.log(req.body);       var schema = new mongoose.schema({}, { strict: false, collection: collection_name });       var model = mongoose.model(collection_name, schema);       restify.serve(app, model, { plural: false, name: collection_name });     }   }   next(); }); 

it posts empty document collection. if change code ever var schema uses post's req.body determine schema post request not go through:

  var schema = new mongoose.schema(req.body, { strict: false, collection: collection_name }); 

where req.body post is:

{   "update_count":       { "type": "string", "required": "false" },   "created_date":       { "type": "string", "required": "false" },   "created_by":         { "type": "string", "required": "false" },   "updated_date":       { "type": "string", "required": "false" },   "updated_by":         { "type": "string", "required": "false" } } 

which returns error , not complete post request because trying use same req.body follow schema i've set , wants use req.body enter document.

{   "message": "testcollection3 validation failed",   "name": "validationerror",   "errors": {     "updated_by": {       "message": "cast string failed value \"[object object]\" @ path \"updated_by\"",       "name": "casterror",       "kind": "string",       "value": {         "type": "string",         "required": "false"       },       "path": "updated_by"     }, .................................. 

how can set schema post , prevent document being created?

as you've seen, mongoose won't create model's collection until needs save document it. however, can create collection explicitly using db#createcollection method native mongodb driver that's accessible via mongoose.connection.db:

mongoose.connection.db.createcollection(collection_name, (err) => {...});