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This is a combined work of Martin Brennan, Loïc Guitaut, and Joffrey Jaffeux. --- This commit implements a base service object when working in chat. The documentation is available at https://discourse.github.io/discourse/chat/backend/Chat/Service.html Generating documentation has been made as part of this commit with a bigger goal in mind of generally making it easier to dive into the chat project. Working with services generally involves 3 parts: - The service object itself, which is a series of steps where few of them are specialized (model, transaction, policy) ```ruby class UpdateAge include Chat::Service::Base model :user, :fetch_user policy :can_see_user contract step :update_age class Contract attribute :age, :integer end def fetch_user(user_id:, **) User.find_by(id: user_id) end def can_see_user(guardian:, **) guardian.can_see_user(user) end def update_age(age:, **) user.update!(age: age) end end ``` - The `with_service` controller helper, handling success and failure of the service within a service and making easy to return proper response to it from the controller ```ruby def update with_service(UpdateAge) do on_success { render_serialized(result.user, BasicUserSerializer, root: "user") } end end ``` - Rspec matchers and steps inspector, improving the dev experience while creating specs for a service ```ruby RSpec.describe(UpdateAge) do subject(:result) do described_class.call(guardian: guardian, user_id: user.id, age: age) end fab!(:user) { Fabricate(:user) } fab!(:current_user) { Fabricate(:admin) } let(:guardian) { Guardian.new(current_user) } let(:age) { 1 } it { expect(user.reload.age).to eq(age) } end ``` Note in case of unexpected failure in your spec, the output will give all the relevant information: ``` 1) UpdateAge when no channel_id is given is expected to fail to find a model named 'user' Failure/Error: it { is_expected.to fail_to_find_a_model(:user) } Expected model 'foo' (key: 'result.model.user') was not found in the result object. [1/4] [model] 'user' ❌ [2/4] [policy] 'can_see_user' [3/4] [contract] 'default' [4/4] [step] 'update_age' /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/update_age.rb:32:in `fetch_user': missing keyword: :user_id (ArgumentError) from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:202:in `instance_exec' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:202:in `call' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:219:in `call' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:417:in `block in run!' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:417:in `each' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:417:in `run!' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:411:in `run' from <internal:kernel>:90:in `tap' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/app/services/base.rb:302:in `call' from /Users/joffreyjaffeux/Code/pr-discourse/plugins/chat/spec/services/update_age_spec.rb:15:in `block (3 levels) in <main>' ```
179 lines
8.0 KiB
HTML
179 lines
8.0 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>Discourse: lib/collection.js</title>
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</head>
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<body>
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<header class="layout-header">
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<h1>
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<a href="./index.html">
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Discourse
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</a>
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</h1>
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<ul><li class="nav-heading">Classes</li><li class="nav-heading"><span class="nav-item-type type-class" title="class">C</span><span class="nav-item-name is-class"><a href="PluginApi.html">PluginApi</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="PluginApi.html#decorateChatMessage">decorateChatMessage</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="PluginApi.html#registerChatComposerButton">registerChatComposerButton</a></span></li><li class="nav-heading"><span class="nav-item-type type-class" title="class">C</span><span class="nav-item-name is-class"><a href="module.exports.html">exports</a></span></li></ul><ul><li class="nav-heading">Modules</li><li class="nav-heading"><span class="nav-item-type type-module" title="module">M</span><span class="nav-item-name is-module"><a href="module-ChatApi.html">ChatApi</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#categoryPermissions">categoryPermissions</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#channel">channel</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#channels">channels</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#createChannel">createChannel</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#createChannelArchive">createChannelArchive</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#destroyChannel">destroyChannel</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#followChannel">followChannel</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#listChannelMemberships">listChannelMemberships</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#listCurrentUserChannels">listCurrentUserChannels</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#moveChannelMessages">moveChannelMessages</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#sendMessage">sendMessage</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#unfollowChannel">unfollowChannel</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#updateChannel">updateChannel</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#updateChannelStatus">updateChannelStatus</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="module-ChatApi.html#updateCurrentUserChannelNotificationsSettings">updateCurrentUserChannelNotificationsSettings</a></span></li></ul><li class="nav-heading"><a href="global.html">Globals</a></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="global.html#load">load</a></span></li><li class="nav-item"><span class="nav-item-type type-function" title="function">F</span><span class="nav-item-name is-function"><a href="global.html#loadMore">loadMore</a></span></li>
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</nav>
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</header>
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<main class="layout-main layout-content--source">
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<div class="container">
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<p class="page-kind">source</p>
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<h1 class="page-title">lib/collection.js</h1>
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<section>
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<article>
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<pre id="source" class="source-page line-numbers"><code class="language-js">import { ajax } from "discourse/lib/ajax";
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import { tracked } from "@glimmer/tracking";
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import { bind } from "discourse-common/utils/decorators";
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import { Promise } from "rsvp";
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/**
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* Handles a paginated API response.
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*/
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export default class Collection {
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@tracked items = [];
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@tracked meta = {};
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@tracked loading = false;
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constructor(resourceURL, handler) {
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this._resourceURL = resourceURL;
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this._handler = handler;
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this._fetchedAll = false;
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}
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get loadMoreURL() {
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return this.meta.load_more_url;
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}
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get totalRows() {
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return this.meta.total_rows;
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}
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get length() {
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return this.items.length;
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols
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[Symbol.iterator]() {
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let index = 0;
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return {
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next: () => {
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if (index < this.items.length) {
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return { value: this.items[index++], done: false };
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} else {
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return { done: true };
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}
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},
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};
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}
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/**
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* Loads first batch of results
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* @returns {Promise}
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*/
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@bind
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load(params = {}) {
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this._fetchedAll = false;
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if (this.loading) {
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return Promise.resolve();
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}
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this.loading = true;
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const filteredQueryParams = Object.entries(params).filter(
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([, v]) => v !== undefined
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);
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const queryString = new URLSearchParams(filteredQueryParams).toString();
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const endpoint = this._resourceURL + (queryString ? `?${queryString}` : "");
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return this.#fetch(endpoint)
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.then((result) => {
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this.items = this._handler(result);
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this.meta = result.meta;
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})
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.finally(() => {
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this.loading = false;
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});
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}
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/**
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* Attempts to load more results
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* @returns {Promise}
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*/
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@bind
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loadMore() {
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let promise = Promise.resolve();
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if (this.loading) {
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return promise;
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}
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if (
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this._fetchedAll ||
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(this.totalRows && this.items.length >= this.totalRows)
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) {
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return promise;
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}
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this.loading = true;
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if (this.loadMoreURL) {
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promise = this.#fetch(this.loadMoreURL).then((result) => {
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const newItems = this._handler(result);
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if (newItems.length) {
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this.items = this.items.concat(newItems);
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} else {
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this._fetchedAll = true;
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}
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this.meta = result.meta;
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});
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}
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return promise.finally(() => {
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this.loading = false;
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});
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}
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#fetch(url) {
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return ajax(url, { type: "GET" });
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}
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}
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</code></pre>
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</article>
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</section>
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</div>
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</main>
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<footer class="layout-footer">
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<div class="container">
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 4.0.0</a>
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</div>
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</footer>
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<script src="scripts/prism.dev.js"></script>
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</body>
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</html>
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