MongoDB via Mongoose JS - What is findByID

Question

I am writing a NodeJS server with ExpressJS  PassportJS  MongoDB and MongooseJS  I just managed to get PassportJS to use user data obtained via Mongoose to authenticate   But to make it work  I had to use a  findById  function like below   var UserModel   db model  User  UserSchema    UserModel findById id  function  err  user     lt  SOME CODE  gt         UserModel is a Mongoose model  I declare the schema  UserSchema earlier  So I suppose UserModel findById   is a method of the Mongoose model   Question  What does findById do and is there documentation on it  I googled around a bit but didn t find anything

User · Answer

I m the maintainer of Mongoose  findById   is a built-in method on Mongoose models  findById id  is equivalent to findOne    id  id     with one caveat  findById   with 0 params is equivalent to findOne    id  null      You can read more about findById   on the Mongoose docs and this findById   tutorial

User · Answer

findById is a convenience method on the model that s provided by Mongoose to find a document by its  id  The documentation for it can be found here   Example        Search by ObjectId var id    56e6dd2eb4494ed008d595bd   UserModel findById id  function  err  user               Functionally  it s the same as calling   UserModel findOne   id  id   function  err  user              Note that Mongoose will cast the provided id value to the type of  id as defined in the schema  defaulting to ObjectId

User · Answer

If the schema of id is not of type ObjectId you cannot operate with function   findbyId

User · Answer

As opposed to find   which can return 1 or more documents  findById   can only return 0 or 1 document  Document s  can be thought of as record s

[mongodb] MongoDB via Mongoose JS - What is findByID?

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