botnaut
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<li class="header">Building a chat bot</li>
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Getting Started
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Building a Conversation
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Asking a question
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Using quick replies
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Postbacks
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Conversation State
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User profile
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Using state in navigation
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Reading and writing state
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Integrating AI
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Redirecting with Postback
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Button Template
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Generic Template
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Receipt Template
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Express Mongodb
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Serverless AWS Lambda
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Responder
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Ai
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Wingbot.ai
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<a href=".." >Conversation State</a>
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<h1 id="working-with-conversation-state"><a name="working-with-conversation-state" class="plugin-anchor" href="#working-with-conversation-state"><i class="fa fa-link" aria-hidden="true"></i></a>Working with conversation state</h1>
<p>Stateless conversation is annoying. Noone wants to repeat, what was said. So <strong>each user has own state object</strong>.</p>
<h2 id="accessing-user-profile"><a name="accessing-user-profile" class="plugin-anchor" href="#accessing-user-profile"><i class="fa fa-link" aria-hidden="true"></i></a>Accessing user profile</h2>
<p>Yes, you already have user profile in state.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">const</span> { Router } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'botnaut'</span>);
<span class="hljs-keyword">const</span> bot = <span class="hljs-keyword">new</span> Router();
bot.use((req, res) => {
<span class="hljs-keyword">const</span> { gender, locale, profilePic, lastName, firstName } = req.state.user;
res.text(<span class="hljs-string">`Hello <span class="hljs-subst">${firstName || 'you!'}</span>`</span>);
});
<span class="hljs-built_in">module</span>.exports = bot;
</code></pre>
<h2 id="using-the-state-in-navigation"><a name="using-the-state-in-navigation" class="plugin-anchor" href="#using-the-state-in-navigation"><i class="fa fa-link" aria-hidden="true"></i></a>Using the state in navigation</h2>
<p>Request object contains <code>.state</code> attribute, which represents state before the event, Responder updates new state with <code>Object.assign()</code> approach.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">const</span> { Router } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'botnaut'</span>);
<span class="hljs-keyword">const</span> bot = <span class="hljs-keyword">new</span> Router();
bot.use(<span class="hljs-string">'/rename'</span>, (req, res) => {
res.text(<span class="hljs-string">'So, how will you call me?'</span>)
.expected(<span class="hljs-string">'setName'</span>);
});
bot.use(<span class="hljs-string">'/setName'</span>, (req, res) => {
<span class="hljs-keyword">const</span> name = req.text();
res.text(<span class="hljs-string">`Now, I'am <span class="hljs-subst">${name}</span>.`</span>)
.setState({ name });
});
bot.use((req, res) => {
<span class="hljs-keyword">const</span> { name } = req.state;
<span class="hljs-keyword">if</span> (name) {
res.text(<span class="hljs-string">`Call me <span class="hljs-subst">${name}</span>, ok?`</span>, {
rename: <span class="hljs-string">'It\'s not ok'</span>
});
} <span class="hljs-keyword">else</span> {
res.text(<span class="hljs-string">'I have no name, give me one!'</span>)
.expected(<span class="hljs-string">'setName'</span>);
}
});
<span class="hljs-built_in">module</span>.exports = bot;
</code></pre>
<p>This example makes conversation flow like this:</p>
<pre><code>*-----------------------------------*
| Hello |
| I have no name, give me one! |
| |
| Albert |
| Now, I'am Albert. |
| |
| Hello |
| Call me Albert, ok? |
| |
| It's not ok |
| So, how will you call me? |
| |
| Alfred |
| Now, I'am Alfred. |
*-----------------------------------*
</code></pre><h2 id="reading-and-modifiing-user-state"><a name="reading-and-modifiing-user-state" class="plugin-anchor" href="#reading-and-modifiing-user-state"><i class="fa fa-link" aria-hidden="true"></i></a>Reading and modifiing user state</h2>
<p>It's good to know, that request state is not modified, when <code>res.setState()</code> is called. It will be modified after dispatching process.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">const</span> { Router } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'botnaut'</span>);
<span class="hljs-keyword">const</span> bot = <span class="hljs-keyword">new</span> Router();
bot.use((req, res) => {
<span class="hljs-comment">// let's give two options to user</span>
<span class="hljs-keyword">if</span> (req.state.odd) {
res.setState({ odd: <span class="hljs-literal">false</span> });
<span class="hljs-comment">// still req.state.odd === true</span>
<span class="hljs-keyword">this</span>.text(<span class="hljs-string">'Odd'</span>);
} <span class="hljs-keyword">else</span> {
res.setState({ odd: <span class="hljs-literal">true</span> });
<span class="hljs-comment">// still req.state.odd === false || req.state.odd === undefined</span>
<span class="hljs-keyword">this</span>.text(<span class="hljs-string">'Even'</span>);
}
});
<span class="hljs-built_in">module</span>.exports = bot;
</code></pre>
<blockquote>
<p>It's better to avoid using "default state", because when you need to change default state in future updates,
you should also migrate current users states to new structure.</p>
</blockquote>
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