问题
how to point to particular collection in mongodb using mongoose ORM in express js app .
NA
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var personSchema = new Schema({
name: String,
age: Number
});
module.exports = mongoose.model('person', personSchema);
consider my mongo database have multiple collection ,so how will my above code will point to particular collection.
回答1:
I'm really sorry my selected answer is not accurate. I can't delete it because it is accepted. The accurate answer to your question is, mongoose.model('person', personSchema); will automatically create a plural lower case version of the model name.In this case, it will automatically create a collection persons in mongoDB if it doesn't exist already.
If you want to override this default behavior, you can do it like this:
var personSchema = new Schema({ name: String, age: Number }, { collection:'people' });
or
mongoose.model( 'person', personSchema, 'people' ) so you refer to it as person, but collection name will be people
回答2:
Usually we follow convention of naming the collection plural in mongoDB. For example in MongoDB, we create users table, but use singular in Node.js. So the exports would be:
module.exports = mongoose.model('users',UserSchema)
And in other script, we require it as follows:
const User=require('<pathToModel>/user')
This means we are referring to the model as User, it is based on UserSchema and the collection associated with this is users
In your code, you could do this:
module.exports = mongoose.model('person', personSchema);
回答3:
If you have a specific collection you want documents based on a specific model to go into, you can use mongoose.model('person', personSchema, collection).
Or, you could name the desired associated collection in the Schema definition:
var dataSchema = new Schema({..}, { collection: 'data' });
https://mongoosejs.com/docs/guide.html
来源：https://stackoverflow.com/questions/53910967/how-to-associate-a-mongoose-model-with-the-right-mongodb-collection-in-express-j