Captain Hook

Pre- and Post- Create and Update Hooks for Mongoose ODM.

Use-Case

Out of the box, Mongoose provides you with the handy pre('save') and post('save') methods. Unfortunately, these hooks run every time the instance is saved, whether it is being created or updated. Captain Hook extends Mongoose to give you greater control over this functionality.

Usage

npm install captain-hook --save

In your Mongoose model:

var captainHook  = require('captain-hook');
var userSchema = mongoose.Schema();
 
userSchema.plugin(captainHook);
 
// function to run before saving a new user instance
userSchema.preCreate(function(user, next){
  console.log("You are about to create a user:" + user.email);
  next();
})
 
// function to run after saving a new user instance
userSchema.postCreate(function(user, next){
  console.log("You just created a user:" + user.email);
  next();
})
 
// function to run before updating an existing user instance
userSchema.preUpdate(function(user, next){
  console.log("You are about to update a user:" + user.email);
  next();
})
 
// function to run before updating an existing user instance
userSchema.postUpdate(function(user, next){
  console.log("You just updated a user:" + user.email);
  next();
})
 

Multiple pre- and post- methods can be added for each timing (preCreate, postCreate, preUpdate, postUpdate) and the functions will be run in the order they are defined.

The next() callback must be called for every hook.

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TO DO:

• Tests for hooks firing in the correct order
• More granular unit tests
  • schema.preCreate()
  • schema.methods.runPreCreate(), etc
  • schema.preCreateMethods array