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DEV: Chat service object initial implementation (#19814) 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>' ```
2023-02-13 20:09:57 +08:00
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Class: Chat::Service::UpdateChannelStatus
&mdash; Documentation by YARD 0.9.28
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<a href="../../_index.html">Index (U)</a> &raquo;
<span class='title'><span class='object_link'><a href="../../Chat.html" title="Chat (module)">Chat</a></span></span> &raquo; <span class='title'><span class='object_link'><a href="../Service.html" title="Chat::Service (module)">Service</a></span></span>
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<span class="title">UpdateChannelStatus</span>
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<div id="content"><h1>Class: Chat::Service::UpdateChannelStatus
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName">Object</span>
<ul class="fullTree">
<li>Object</li>
<li class="next">Chat::Service::UpdateChannelStatus</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Includes:</dt>
<dd><span class='object_link'><a href="Base.html" title="Chat::Service::Base (module)">Base</a></span></dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>plugins/chat/app/services/update_channel_status.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>Service responsible for updating a chat channel status.</p>
</div>
</div>
<div class="tags">
<div class="examples">
<p class="tag_title">Examples:</p>
<pre class="example code"><code><span class='const'><span class='object_link'><a href="../../Chat.html" title="Chat (module)">Chat</a></span></span><span class='op'>::</span><span class='const'><span class='object_link'><a href="../Service.html" title="Chat::Service (module)">Service</a></span></span><span class='op'>::</span><span class='const'>UpdateChannelStatus</span><span class='period'>.</span><span class='id identifier rubyid_call'><span class='object_link'><a href="#call-instance_method" title="Chat::Service::UpdateChannelStatus#call (method)">call</a></span></span><span class='lparen'>(</span><span class='label'>channel_id:</span> <span class='int'>2</span><span class='comma'>,</span> <span class='label'>guardian:</span> <span class='id identifier rubyid_guardian'>guardian</span><span class='comma'>,</span> <span class='label'>status:</span> <span class='tstring'><span class='tstring_beg'>&quot;</span><span class='tstring_content'>open</span><span class='tstring_end'>&quot;</span></span><span class='rparen'>)</span></code></pre>
</div>
</div>
<h2>
Instance Method Summary
<small><a href="#" class="summary_toggle">collapse</a></small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#call-instance_method" title="#call (instance method)">#<strong>call</strong>(channel_id: , guardian: , status: ) &#x21d2; Chat::Service::Base::Context </a>
</span>
<span class="summary_desc"><div class='inline'></div></span>
</li>
</ul>
<h3 class="inherited">Methods included from <span class='object_link'><a href="Base.html" title="Chat::Service::Base (module)">Base</a></span></h3>
<p class="inherited"><span class='object_link'><a href="Base.html#contract-class_method" title="Chat::Service::Base.contract (method)">contract</a></span>, <span class='object_link'><a href="Base.html#model-class_method" title="Chat::Service::Base.model (method)">model</a></span>, <span class='object_link'><a href="Base.html#policy-class_method" title="Chat::Service::Base.policy (method)">policy</a></span>, <span class='object_link'><a href="Base.html#step-class_method" title="Chat::Service::Base.step (method)">step</a></span>, <span class='object_link'><a href="Base.html#transaction-class_method" title="Chat::Service::Base.transaction (method)">transaction</a></span></p>
<div id="instance_method_details" class="method_details_list">
<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="call-instance_method">
#<strong>call</strong>(channel_id: , guardian: , status: ) &#x21d2; <tt><span class='object_link'><a href="Base/Context.html" title="Chat::Service::Base::Context (class)">Chat::Service::Base::Context</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>channel_id</span>
<span class='type'>(<tt>Integer</tt>)</span>
<em class="default">(defaults to: <tt></tt>)</em>
</li>
<li>
<span class='name'>guardian</span>
<span class='type'>(<tt>Guardian</tt>)</span>
<em class="default">(defaults to: <tt></tt>)</em>
</li>
<li>
<span class='name'>status</span>
<span class='type'>(<tt>String</tt>)</span>
<em class="default">(defaults to: <tt></tt>)</em>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt><span class='object_link'><a href="Base/Context.html" title="Chat::Service::Base::Context (class)">Chat::Service::Base::Context</a></span></tt>)</span>
</li>
</ul>
</div>
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