Declare a schema and collection at the same times! #meteorjs

gistfile1.js

Posts = new Meteor.Collection("posts", {
  schema: new SimpleSchema({
    title: {
      type: String,
      optional: true
    },
    description: {
      type: String,
      optional: true
    },
    posted: {
      type: Date,
      optional: true
    }
  })
});