Sometimes you want to update multiple resources e.g. via REST sending a PUT /todos or DELETE /todos. Supporting this is fairly easy, the question is what method signatures to use. Currently I see two options.

Option 1: *Many service methods

We could add updateMany, patchMany and removeMany (and possibly createMany although it would just be passing an array to create).

var myService = {
  find: function(params, callback) {},
  get: function(id, params, callback) {},
  create: function(data, params, callback) {},
  update: function(id, data, params, callback) {},
  updateMany: function(data, params, callback) {},
  patch: function(id, data, params, callback) {},
  patchMany: function(data, params, callback) {},
  remove: function(id, params, callback) {},
  removeMany: function(params, callback) {},
  setup: function(app) {}
}

• + Backwards compatible
• - Cluttered service interface

Option 2: null values for id

The other option is to pass a null value as an id when operating on multiple resources.

app.use('/todos', {
  remove: function(id, params, callback) {
    if(id === null) {
    }
  }
}

• + Keeps service interface the same
• - Could break backwards compatibility in some cases (although you would most likely just return a notFound error)