text: import { Posts } from 'meteor/example-forum';
  
  /*
  Let's assign a color to each post (why? cause we want to, that's why).
  We'll do that by adding a custom field to the Posts collection.
  Note that this requires our custom package to depend on vulcan:posts and vulcan:users.
  */
  
  Posts.addField(
    {
      fieldName: 'color',
      fieldSchema: {
        type: String,
        control: "select", // use a select form control
        optional: true, // this field is not required
        insertableBy: ['members'],
        editableBy: ['members'],
        viewableBy: ['members'],
        options: function () { // options for the select form control
          return [
            {value: "white", label: "White"},
            {value: "yellow", label: "Yellow"},
            {value: "blue", label: "Blue"},
            {value: "red", label: "Red"},
            {value: "green", label: "Green"}
          ];
        }
      }
    }
  );
  