Telescope Nova

Nova is a top-secret, highly unstable experimental branch of Telescope with a really cool name.

Table Of Contents

• Install
• Updating
• Resources
• Deployment
• Settings
• Social Login
• Packages
• Files
• Customizing Components
• Custom Fields
• Publishing Data
• Loading Data
• Callbacks
• Posts Parameters
• Forms
• Methods
• Cheatsheet

Install

1. Clone this branch to your local machine
2. Run npm install
3. Run meteor

Note: the nova:* packages are not currently published to Atmosphere.

Updating

To keep your codebase up to date, you'll have to manually pull in the changes from this git repo for now. Automated updating via meteor update is not yet supported, although it will be soon.

To update to Nova from an earlier version of Telescope, I suggest you create a new repo and start from scratch. That being said you can use the same database seamlessly since Nova uses the same database schema.

For local development, an easy way to do that is to simply copy the .meteor/local directory which contains your local database to your new repo.

Resources

The best way to get support is the #nova channel in the Telescope Slack Chatroom.

You can also check out the Nova roadmap on Trello to see what needs to be done.

Deployment

The recommended way to deploy Nova is by using MupX.

Settings

Settings can be configured in your settings.json file (although any settings published to the Telescope.settings.collection collection will also be taken into account).

Settings can be public (meaning they will be published to the client) or private (they will be kept on the server). Public settings should be set on the public object. You can find a full example in sample_settings.json.

To use your settings.json file:

• Development: meteor --settings settings.json
• Production: specify the path to settings.json in mup.json

See also the /settings route inside your app.

Social Login

To add new social login options, just add the relevant package (accounts-twitter, accounts-facebook, etc.) to your .meteor/packages file with (for example):

meteor add accounts-twitter

Note: you will need to configure the service's oAuth tokens via the log-in UI, or directly in the database.

Packages

Core Packages

These packages are necessary for Nova to run.

• lib: utility functions used by the app; also handles all external packages.
• events: event tracking.
• i18n: internationalization.
• core: import previous core packages.

Optional Packages

These packages are optional, although they might depend on each other. Note that dependencies on non-core packages should be weak whenever possible.

• settings: publish the Settings collection (for backwards compatibility)
• posts
• comments
• users
• search
• tags
• vote
• scoring
• forms (README)

Theme Packages

• base-components
• base-styles

Files

Nova tries to maintain a consistent file structure for its main packages:

• config.js: the package's main namespace and set basic config options.
• collection.js: the package's collection schema.
• callbacks.js: callbacks used by the package.
• helpers.js: collection helpers.
• methods.js: collectiom methods.
• published_fields.js: specifies which collection fields should be published in which context.
• custom_fields.js: sets custom fields on other collections.
• routes.jsx: routes.
• views.js: views used for query constructors.
• parameters.js: the collection's query constructor.
• server/publications.js: publications.

Customizing Components

Apart from a couple exceptions, almost all React components in Nova live inside the nova:base-components package. There are two main ways of customizing them.

Override

If you only need to modify a single component, you can simply override it with a new one without having to touch the nova:base-components package.

For example, if you wanted to use your own CustomLogo component you would do:

class CustomLogo extends Telescope.components.Logo{
  render() {
    return (
      <div>/* custom component code */</div>;
    )
  } 
}
Telescope.components.Logo = CustomLogo;

Nova components are resolved at render. So you just need to make the override anytime before the <Logo/> component is called from a parent component.

Clone & Modify

For more in-depth customizations, you can also just clone the entire nova:base-components package and then make your modification directly there.

Of course, keeping your own new components package up to date with any future nova:base-components modifications will then be up to you.

Custom Fields

Out of the box, Nova has three main collections: Posts, Users, and Comments. Each of them has a pre-set schema, but that schema can also be extended with custom fields.

For example, this is how the nova:newsletter package extends the Posts schema with a scheduledAt property that keeps track of when a post was sent out as part of an email newsletter:

Posts.addField({
  fieldName: 'scheduledAt',
  fieldSchema: {
    type: Date,
    optional: true
  }
});

The collection.addField() function takes either a field object, or an array of fields. Each field has a fieldName property, and a fieldSchema property.

Each field schema supports all of the SimpleSchema properties, such as type, optional, etc.

A few special properties (insertableIf, editableIf, control, and order) are also supported by the nova:forms package.

Note that Telescope provides a few utility function out of the box to use with insertableIf and editableIf:

• Users.is.admin: returns true if a user is an admin.
• Users.is.memberOrAdmin: returns true if a user is a member (i.e. has an account and is currently logged in) or an admin.
• Users.is.ownerOrAdmin: (editing only) returns true if a user is a members and owns the document being edited; or is an admin.

Additionally, the publish and join properties come from the Smart Publications package. Setting publish to true indicates that a field should be published to the client (see also next section).

You can also remove a field by calling collection.removeField(fieldName). For example:

Posts.removeField('scheduledAt');

Publishing Data

In order to make data available to the cient, you need to publish it. Out of the box, Nova includes the following publications:

• posts.list: a list of posts
• posts.single: a single post (includes more data)
• comments.list: a list of comments
• users.single: a single user
• users.current: the current user (includes personal data)

While most publications look up each field's publish property to figure out if they should publish it or not, some (like posts.list and comments.list) only feature a smaller subset of properties for performance reasons, and thus have their own specific list of published fields.

For example, here's how the nova:embedly adds the thumbnailUrl, media, soureName, and sourceUrlfields to the list of published fields for theposts.list` publication (after having defined them as custom fields):

import PublicationUtils from 'meteor/utilities:smart-publications';

PublicationUtils.addToFields(Posts.publishedFields.list, ["thumbnailUrl", "media", "sourceName", "sourceUrl"]);

Loading Data

To load data and display it as a list of documents (or a single document), Nova uses the React List Container package to connect to the publications mentioned in the previous section.

Callbacks

Nova uses a system of hooks and callbacks for many of its operations.

For example, here's how you would add a callback to posts.edit.sync to give posts an editedAt date every time they are modified:

function setEditedAt (post, user) {
  post.editedAt = new Date();
  return post;
}
Telescope.callbacks.add("posts.edit.sync", setEditedAt);

If the callback function is named (i.e. declared using the function foo () {} syntax), you can also remove it from the callback using:

Telescope.callbacks.remove("posts.edit.sync", "setEditedAt");

Methods support four distinct types of callbacks, each with their own hook:

• client callbacks are only called on the client, before the actual method is called.
• method callbacks are called within the body of the method, and they run both on the client and server.
• sync callbacks are called in the mutator, and can run either on both client and server, or on the server only if the mutator is called directly.
• async callbacks are called in the mutator, and only run on the server in an async non-blocking way.

Posts Parameters

In order to filter posts by category, keyword, view, etc. Nova uses a system of successive callbacks to translate filtering options into MongoDB database queries.

For example, here is how the nova:search package adds a callback to handle the query parameter:

function addSearchQueryParameter (parameters, terms) {
  if(!!terms.query) {
    var parameters = Telescope.utils.deepExtend(true, parameters, {
      selector: {
        $or: [
          {title: {$regex: terms.query, $options: 'i'}},
          {url: {$regex: terms.query, $options: 'i'}},
          {body: {$regex: terms.query, $options: 'i'}}
        ]
      }
    });
  }
  return parameters;
}
Telescope.callbacks.add("postsParameters", addSearchQueryParameter);

The callback takes two arguments: the current MongoDB parameters (an object with a selector and options properties), and the terms extracted from the URL.

It then tests for the presence of a query property in the terms, and if it finds one it then extends the parameter object with a MongoDB RegEx search query.

Finally, it then returns parameters to pass it on to the next callback (or to the database itself if this happens to be the last callback).

The view, category, after, before, etc. URL parameters are all handled using their own similar callbacks.

Forms

See nova:forms package readme.

Methods

You can use regular Meteor methods, or Smart Methods.

Cheatsheet

You can access a dynamically generated cheatsheet of Nova's main functions at http://localhost:3000/cheatsheet (replace with your own development URL).