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laravel_advanced_eloquent-speaker.html
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<!DOCTYPE html>
<html lang="en"><head>
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<meta name="author" content="Vladimir Lelicanin - SAE Institute">
<title>Laravel Advanced Eloquent</title>
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<div class="slides">
<section id="title-slide" data-background-image="https://keystoneacademic-res.cloudinary.com/image/upload/f_auto/q_auto/g_auto/w_256/element/15/156456_sae.jpg" data-background-position="top left" data-background-repeat="no-repeat" data-background-size="100px" class="quarto-title-block center">
<h1 class="title">Laravel Advanced Eloquent</h1>
<div class="quarto-title-authors">
<div class="quarto-title-author">
<div class="quarto-title-author-name">
Vladimir Lelicanin - SAE Institute
</div>
</div>
</div>
</section>
<section id="laravel-advanced-eloquent" class="slide level1">
<h1>Laravel Advanced Eloquent</h1>
<h2 id="introduction">Introduction</h2>
<ul>
<li>Eloquent ORM is a PHP library used for working with databases</li>
<li>Allows high-level queries instead of writing SQL statements</li>
<li>Provides relation mappings, eager loading, and other useful features</li>
<li>Advanced Eloquent takes advantage of these features for more complex situations</li>
</ul>
</section>
<section class="slide level1">
<h2 id="model-scopes">Model Scopes</h2>
<ul>
<li>A method on a model that returns a query builder instance</li>
<li>Can be chained onto a query to apply logic globally</li>
<li>Great for repetitive queries or to abstract complex queries</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb1"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb1-1"><a href="#cb1-1"></a><span class="kw">class</span> <span class="cn">P</span>ost <span class="kw">extends</span> <span class="cn">M</span>odel</span>
<span id="cb1-2"><a href="#cb1-2"></a>{</span>
<span id="cb1-3"><a href="#cb1-3"></a> <span class="kw">public</span> <span class="kw">function</span> scopePublished(<span class="va">$query</span>)</span>
<span id="cb1-4"><a href="#cb1-4"></a> {</span>
<span id="cb1-5"><a href="#cb1-5"></a> <span class="cf">return</span> <span class="va">$query</span>->where(<span class="st">'published'</span><span class="ot">,</span> <span class="kw">true</span>)<span class="ot">;</span></span>
<span id="cb1-6"><a href="#cb1-6"></a> }</span>
<span id="cb1-7"><a href="#cb1-7"></a>}</span>
<span id="cb1-8"><a href="#cb1-8"></a></span>
<span id="cb1-9"><a href="#cb1-9"></a><span class="co">// Usage:</span></span>
<span id="cb1-10"><a href="#cb1-10"></a><span class="va">$posts</span> <span class="op">=</span> <span class="cn">P</span>ost::published()->get()<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent#query-scopes">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="global-scopes">Global Scopes</h2>
<ul>
<li>Similar to model scopes but applied to every query automatically</li>
<li>Can be useful for multi-tenant applications or certain security requirements</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb2"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb2-1"><a href="#cb2-1"></a><span class="kw">class</span> <span class="cn">T</span>enantScope <span class="kw">implements</span> <span class="cn">S</span>cope</span>
<span id="cb2-2"><a href="#cb2-2"></a>{</span>
<span id="cb2-3"><a href="#cb2-3"></a> <span class="kw">public</span> <span class="kw">function</span> apply(<span class="cn">B</span>uilder <span class="va">$builder</span><span class="ot">,</span> <span class="cn">M</span>odel <span class="va">$model</span>)</span>
<span id="cb2-4"><a href="#cb2-4"></a> {</span>
<span id="cb2-5"><a href="#cb2-5"></a> <span class="va">$builder</span>->where(<span class="st">'tenant_id'</span><span class="ot">,</span> auth()->user()->tenant_id)<span class="ot">;</span></span>
<span id="cb2-6"><a href="#cb2-6"></a> }</span>
<span id="cb2-7"><a href="#cb2-7"></a>}</span>
<span id="cb2-8"><a href="#cb2-8"></a></span>
<span id="cb2-9"><a href="#cb2-9"></a><span class="co">// In the model:</span></span>
<span id="cb2-10"><a href="#cb2-10"></a><span class="kw">protected</span> <span class="kw">static</span> <span class="kw">function</span> boot()</span>
<span id="cb2-11"><a href="#cb2-11"></a>{</span>
<span id="cb2-12"><a href="#cb2-12"></a> <span class="kw">parent</span>::boot()<span class="ot">;</span></span>
<span id="cb2-13"><a href="#cb2-13"></a> <span class="kw">static</span>::addGlobalScope(<span class="kw">new</span> <span class="cn">T</span>enantScope())<span class="ot">;</span></span>
<span id="cb2-14"><a href="#cb2-14"></a>}</span>
<span id="cb2-15"><a href="#cb2-15"></a></span>
<span id="cb2-16"><a href="#cb2-16"></a><span class="co">// Usage:</span></span>
<span id="cb2-17"><a href="#cb2-17"></a><span class="va">$posts</span> <span class="op">=</span> <span class="cn">P</span>ost::all()<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent#global-scopes">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="polymorphic-relations">Polymorphic Relations</h2>
<ul>
<li>One table can belong to multiple other tables with a single relationship</li>
<li>Great for keeping records flexible</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb3"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb3-1"><a href="#cb3-1"></a><span class="kw">class</span> <span class="cn">I</span>mage <span class="kw">extends</span> <span class="cn">M</span>odel</span>
<span id="cb3-2"><a href="#cb3-2"></a>{</span>
<span id="cb3-3"><a href="#cb3-3"></a> <span class="kw">public</span> <span class="kw">function</span> imageable()</span>
<span id="cb3-4"><a href="#cb3-4"></a> {</span>
<span id="cb3-5"><a href="#cb3-5"></a> <span class="cf">return</span> <span class="va">$this</span>->morphTo()<span class="ot">;</span></span>
<span id="cb3-6"><a href="#cb3-6"></a> }</span>
<span id="cb3-7"><a href="#cb3-7"></a>}</span>
<span id="cb3-8"><a href="#cb3-8"></a></span>
<span id="cb3-9"><a href="#cb3-9"></a><span class="kw">class</span> <span class="cn">P</span>ost <span class="kw">extends</span> <span class="cn">M</span>odel</span>
<span id="cb3-10"><a href="#cb3-10"></a>{</span>
<span id="cb3-11"><a href="#cb3-11"></a> <span class="kw">public</span> <span class="kw">function</span> images()</span>
<span id="cb3-12"><a href="#cb3-12"></a> {</span>
<span id="cb3-13"><a href="#cb3-13"></a> <span class="cf">return</span> <span class="va">$this</span>->morphMany(<span class="cn">I</span>mage::<span class="kw">class</span><span class="ot">,</span> <span class="st">'imageable'</span>)<span class="ot">;</span></span>
<span id="cb3-14"><a href="#cb3-14"></a> }</span>
<span id="cb3-15"><a href="#cb3-15"></a>}</span>
<span id="cb3-16"><a href="#cb3-16"></a></span>
<span id="cb3-17"><a href="#cb3-17"></a><span class="kw">class</span> <span class="cn">P</span>roduct <span class="kw">extends</span> <span class="cn">M</span>odel</span>
<span id="cb3-18"><a href="#cb3-18"></a>{</span>
<span id="cb3-19"><a href="#cb3-19"></a> <span class="kw">public</span> <span class="kw">function</span> images()</span>
<span id="cb3-20"><a href="#cb3-20"></a> {</span>
<span id="cb3-21"><a href="#cb3-21"></a> <span class="cf">return</span> <span class="va">$this</span>->morphMany(<span class="cn">I</span>mage::<span class="kw">class</span><span class="ot">,</span> <span class="st">'imageable'</span>)<span class="ot">;</span></span>
<span id="cb3-22"><a href="#cb3-22"></a> }</span>
<span id="cb3-23"><a href="#cb3-23"></a>}</span>
<span id="cb3-24"><a href="#cb3-24"></a></span>
<span id="cb3-25"><a href="#cb3-25"></a><span class="co">// Usage:</span></span>
<span id="cb3-26"><a href="#cb3-26"></a><span class="va">$postImages</span> <span class="op">=</span> <span class="va">$post</span>->images<span class="ot">;</span></span>
<span id="cb3-27"><a href="#cb3-27"></a><span class="va">$productImages</span> <span class="op">=</span> <span class="va">$product</span>->images<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent-relationships#polymorphic-relationships">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="accessors-and-mutators">Accessors and Mutators</h2>
<ul>
<li>Used to modify or retrieve Eloquent model attributes</li>
<li>Great for formatting data before or after it’s saved to the database</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb4"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb4-1"><a href="#cb4-1"></a><span class="kw">class</span> <span class="cn">U</span>ser <span class="kw">extends</span> <span class="cn">M</span>odel</span>
<span id="cb4-2"><a href="#cb4-2"></a>{</span>
<span id="cb4-3"><a href="#cb4-3"></a> <span class="kw">public</span> <span class="kw">function</span> getNameAttribute(<span class="va">$value</span>)</span>
<span id="cb4-4"><a href="#cb4-4"></a> {</span>
<span id="cb4-5"><a href="#cb4-5"></a> <span class="cf">return</span> <span class="fu">ucfirst</span>(<span class="va">$value</span>)<span class="ot">;</span></span>
<span id="cb4-6"><a href="#cb4-6"></a> }</span>
<span id="cb4-7"><a href="#cb4-7"></a> </span>
<span id="cb4-8"><a href="#cb4-8"></a> <span class="kw">public</span> <span class="kw">function</span> setPasswordAttribute(<span class="va">$value</span>)</span>
<span id="cb4-9"><a href="#cb4-9"></a> {</span>
<span id="cb4-10"><a href="#cb4-10"></a> <span class="va">$this</span>->attributes[<span class="st">'password'</span>] <span class="op">=</span> bcrypt(<span class="va">$value</span>)<span class="ot">;</span></span>
<span id="cb4-11"><a href="#cb4-11"></a> }</span>
<span id="cb4-12"><a href="#cb4-12"></a>}</span>
<span id="cb4-13"><a href="#cb4-13"></a></span>
<span id="cb4-14"><a href="#cb4-14"></a><span class="co">// Usage:</span></span>
<span id="cb4-15"><a href="#cb4-15"></a><span class="va">$user</span> <span class="op">=</span> <span class="kw">new</span> <span class="cn">U</span>ser()<span class="ot">;</span></span>
<span id="cb4-16"><a href="#cb4-16"></a><span class="va">$user</span>->name <span class="op">=</span> <span class="st">'john'</span><span class="ot">;</span></span>
<span id="cb4-17"><a href="#cb4-17"></a><span class="va">$user</span>->password <span class="op">=</span> <span class="st">'password123'</span><span class="ot">;</span></span>
<span id="cb4-18"><a href="#cb4-18"></a><span class="va">$user</span>->save()<span class="ot">;</span></span>
<span id="cb4-19"><a href="#cb4-19"></a><span class="kw">echo</span> <span class="va">$user</span>->name<span class="ot">;</span> <span class="co">// John</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent-mutators#defining-an-accessor">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="model-observers">Model Observers</h2>
<ul>
<li>Listens for specific Eloquent model events</li>
<li>Can be used to perform additional actions during those events</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb5"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb5-1"><a href="#cb5-1"></a><span class="kw">class</span> <span class="cn">U</span>serObserver</span>
<span id="cb5-2"><a href="#cb5-2"></a>{</span>
<span id="cb5-3"><a href="#cb5-3"></a> <span class="kw">public</span> <span class="kw">function</span> created(<span class="cn">U</span>ser <span class="va">$user</span>)</span>
<span id="cb5-4"><a href="#cb5-4"></a> {</span>
<span id="cb5-5"><a href="#cb5-5"></a> <span class="fu">Mail</span>::to(<span class="va">$user</span>->email)->send(<span class="kw">new</span> <span class="cn">W</span>elcomeEmail())<span class="ot">;</span></span>
<span id="cb5-6"><a href="#cb5-6"></a> }</span>
<span id="cb5-7"><a href="#cb5-7"></a>}</span>
<span id="cb5-8"><a href="#cb5-8"></a></span>
<span id="cb5-9"><a href="#cb5-9"></a><span class="co">// In a service provider:</span></span>
<span id="cb5-10"><a href="#cb5-10"></a><span class="kw">public</span> <span class="kw">function</span> boot()</span>
<span id="cb5-11"><a href="#cb5-11"></a>{</span>
<span id="cb5-12"><a href="#cb5-12"></a> <span class="cn">U</span>ser::observe(<span class="cn">U</span>serObserver::<span class="kw">class</span>)<span class="ot">;</span></span>
<span id="cb5-13"><a href="#cb5-13"></a>}</span>
<span id="cb5-14"><a href="#cb5-14"></a></span>
<span id="cb5-15"><a href="#cb5-15"></a><span class="co">// Usage:</span></span>
<span id="cb5-16"><a href="#cb5-16"></a><span class="va">$user</span> <span class="op">=</span> <span class="kw">new</span> <span class="cn">U</span>ser()<span class="ot">;</span></span>
<span id="cb5-17"><a href="#cb5-17"></a><span class="va">$user</span>->name <span class="op">=</span> <span class="st">'Jane'</span><span class="ot">;</span></span>
<span id="cb5-18"><a href="#cb5-18"></a><span class="va">$user</span>->email <span class="op">=</span> <span class="st">'[email protected]'</span><span class="ot">;</span></span>
<span id="cb5-19"><a href="#cb5-19"></a><span class="va">$user</span>->password <span class="op">=</span> <span class="st">'password123'</span><span class="ot">;</span></span>
<span id="cb5-20"><a href="#cb5-20"></a><span class="va">$user</span>->save()<span class="ot">;</span> <span class="co">// Sends welcome email to [email protected]</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent#observers">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="eager-loading">Eager Loading</h2>
<ul>
<li>Used to load relationships with fewer queries</li>
<li>Can help performance by reducing database trips</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb6"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb6-1"><a href="#cb6-1"></a><span class="co">// Without eager loading:</span></span>
<span id="cb6-2"><a href="#cb6-2"></a><span class="va">$users</span> <span class="op">=</span> <span class="cn">U</span>ser::all()<span class="ot">;</span></span>
<span id="cb6-3"><a href="#cb6-3"></a><span class="cf">foreach</span> (<span class="va">$users</span> <span class="kw">as</span> <span class="va">$user</span>) {</span>
<span id="cb6-4"><a href="#cb6-4"></a> <span class="kw">echo</span> <span class="va">$user</span>->posts-><span class="fu">count</span>()<span class="ot">;</span> <span class="co">// N+1 problem</span></span>
<span id="cb6-5"><a href="#cb6-5"></a>}</span>
<span id="cb6-6"><a href="#cb6-6"></a></span>
<span id="cb6-7"><a href="#cb6-7"></a><span class="co">// With eager loading:</span></span>
<span id="cb6-8"><a href="#cb6-8"></a><span class="va">$users</span> <span class="op">=</span> <span class="cn">U</span>ser::with(<span class="st">'posts'</span>)->get()<span class="ot">;</span></span>
<span id="cb6-9"><a href="#cb6-9"></a><span class="cf">foreach</span> (<span class="va">$users</span> <span class="kw">as</span> <span class="va">$user</span>) {</span>
<span id="cb6-10"><a href="#cb6-10"></a> <span class="kw">echo</span> <span class="va">$user</span>->posts-><span class="fu">count</span>()<span class="ot">;</span> <span class="co">// No additional queries</span></span>
<span id="cb6-11"><a href="#cb6-11"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent-relationships#eager-loading">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="query-optimization">Query Optimization</h2>
<ul>
<li>Use <code>select</code>, <code>where</code>, and <code>orderBy</code> to optimize queries</li>
<li>Use the <code>DB::enableQueryLog()</code> and <code>DB::getQueryLog()</code> methods to analyze queries</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb7"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb7-1"><a href="#cb7-1"></a><span class="cn">DB</span>::enableQueryLog()<span class="ot">;</span></span>
<span id="cb7-2"><a href="#cb7-2"></a></span>
<span id="cb7-3"><a href="#cb7-3"></a><span class="va">$posts</span> <span class="op">=</span> <span class="cn">P</span>ost::select(<span class="st">'id'</span><span class="ot">,</span> <span class="st">'title'</span>)</span>
<span id="cb7-4"><a href="#cb7-4"></a> ->where(<span class="st">'user_id'</span><span class="ot">,</span> <span class="dv">1</span>)</span>
<span id="cb7-5"><a href="#cb7-5"></a> ->orderBy(<span class="st">'created_at'</span><span class="ot">,</span> <span class="st">'desc'</span>)</span>
<span id="cb7-6"><a href="#cb7-6"></a> ->get()<span class="ot">;</span></span>
<span id="cb7-7"><a href="#cb7-7"></a></span>
<span id="cb7-8"><a href="#cb7-8"></a>dd(<span class="cn">DB</span>::getQueryLog())<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/queries#selects">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="caching">Caching</h2>
<ul>
<li>Cache data to reduce database trips</li>
<li>Several cache systems supported by Laravel, including Redis and Memcached</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb8"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb8-1"><a href="#cb8-1"></a><span class="va">$posts</span> <span class="op">=</span> <span class="cn">C</span>ache::remember(<span class="st">'posts.all'</span><span class="ot">,</span> <span class="dv">3600</span><span class="ot">,</span> <span class="kw">function</span> () {</span>
<span id="cb8-2"><a href="#cb8-2"></a> <span class="cf">return</span> <span class="cn">P</span>ost::all()<span class="ot">;</span></span>
<span id="cb8-3"><a href="#cb8-3"></a>})<span class="ot">;</span></span>
<span id="cb8-4"><a href="#cb8-4"></a></span>
<span id="cb8-5"><a href="#cb8-5"></a><span class="co">// Data is now cached for one hour</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/cache">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="raw-expressions">Raw Expressions</h2>
<ul>
<li>Allows you to write raw SQL in Eloquent queries</li>
<li>Can be useful for more complex queries that are difficult to achieve with Eloquent</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb9"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb9-1"><a href="#cb9-1"></a><span class="cn">DB</span>::table(<span class="st">'users'</span>)</span>
<span id="cb9-2"><a href="#cb9-2"></a> ->select(<span class="cn">DB</span>::raw(<span class="st">'count(*) as user_count, status'</span>))</span>
<span id="cb9-3"><a href="#cb9-3"></a> ->where(<span class="st">'status'</span><span class="ot">,</span> <span class="st">'<>'</span><span class="ot">,</span> <span class="dv">1</span>)</span>
<span id="cb9-4"><a href="#cb9-4"></a> ->groupBy(<span class="st">'status'</span>)</span>
<span id="cb9-5"><a href="#cb9-5"></a> ->get()<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/queries#raw-expressions">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="subqueries">SubQueries</h2>
<ul>
<li>Allows you to nest queries within other queries</li>
<li>Can be useful for advanced filtering or grouping</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb10"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb10-1"><a href="#cb10-1"></a><span class="va">$posts</span> <span class="op">=</span> <span class="cn">P</span>ost::where(<span class="st">'created_at'</span><span class="ot">,</span> <span class="st">'>='</span><span class="ot">,</span> <span class="kw">function</span>(<span class="va">$query</span>) {</span>
<span id="cb10-2"><a href="#cb10-2"></a> <span class="va">$query</span>->selectRaw(<span class="st">'DATE_SUB(NOW(), INTERVAL 1 WEEK)'</span>)</span>
<span id="cb10-3"><a href="#cb10-3"></a> ->from(<span class="st">'posts'</span>)</span>
<span id="cb10-4"><a href="#cb10-4"></a> ->where(<span class="st">'published'</span><span class="ot">,</span> <span class="kw">true</span>)</span>
<span id="cb10-5"><a href="#cb10-5"></a> ->orderBy(<span class="st">'created_at'</span><span class="ot">,</span> <span class="st">'desc'</span>)</span>
<span id="cb10-6"><a href="#cb10-6"></a> ->skip(<span class="dv">10</span>)</span>
<span id="cb10-7"><a href="#cb10-7"></a> ->take(<span class="dv">1</span>)<span class="ot">;</span></span>
<span id="cb10-8"><a href="#cb10-8"></a>})->get()<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/queries#subquery-selects">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="inserting-updating-records">Inserting & Updating Records</h2>
<ul>
<li>Use <code>create()</code> to insert a new record</li>
<li>Use the <code>update()</code> method for updating records</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb11"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb11-1"><a href="#cb11-1"></a><span class="co">// Creating a new record:</span></span>
<span id="cb11-2"><a href="#cb11-2"></a><span class="cn">P</span>ost::create([</span>
<span id="cb11-3"><a href="#cb11-3"></a> <span class="st">'title'</span> => <span class="st">'My New Post'</span><span class="ot">,</span></span>
<span id="cb11-4"><a href="#cb11-4"></a> <span class="st">'body'</span> => <span class="st">'Lorem ipsum dolor sit amet.'</span></span>
<span id="cb11-5"><a href="#cb11-5"></a>])<span class="ot">;</span></span>
<span id="cb11-6"><a href="#cb11-6"></a></span>
<span id="cb11-7"><a href="#cb11-7"></a><span class="co">// Updating a record:</span></span>
<span id="cb11-8"><a href="#cb11-8"></a><span class="va">$post</span> <span class="op">=</span> <span class="cn">P</span>ost::find(<span class="dv">1</span>)<span class="ot">;</span></span>
<span id="cb11-9"><a href="#cb11-9"></a><span class="va">$post</span>->update([</span>
<span id="cb11-10"><a href="#cb11-10"></a> <span class="st">'title'</span> => <span class="st">'My Updated Post'</span><span class="ot">,</span></span>
<span id="cb11-11"><a href="#cb11-11"></a> <span class="st">'body'</span> => <span class="st">'Lorem ipsum dolor sit amet.'</span></span>
<span id="cb11-12"><a href="#cb11-12"></a>])<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent#inserting-and-updating-models">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="soft-deleting">Soft Deleting</h2>
<ul>
<li>Use soft deleting to mark records as deleted instead of actually deleting them</li>
<li>Can be useful for accidentally deleted records or records that need to be retrieved later</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb12"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb12-1"><a href="#cb12-1"></a><span class="kw">use</span> <span class="cn">I</span>lluminate\<span class="cn">D</span>atabase\<span class="cn">E</span>loquent\<span class="cn">S</span>oftDeletes<span class="ot">;</span></span>
<span id="cb12-2"><a href="#cb12-2"></a></span>
<span id="cb12-3"><a href="#cb12-3"></a><span class="kw">class</span> <span class="cn">P</span>ost <span class="kw">extends</span> <span class="cn">M</span>odel</span>
<span id="cb12-4"><a href="#cb12-4"></a>{</span>
<span id="cb12-5"><a href="#cb12-5"></a> <span class="kw">use</span> <span class="cn">S</span>oftDeletes<span class="ot">;</span></span>
<span id="cb12-6"><a href="#cb12-6"></a> </span>
<span id="cb12-7"><a href="#cb12-7"></a> <span class="kw">protected</span> <span class="va">$dates</span> <span class="op">=</span> [<span class="st">'deleted_at'</span>]<span class="ot">;</span></span>
<span id="cb12-8"><a href="#cb12-8"></a>}</span>
<span id="cb12-9"><a href="#cb12-9"></a></span>
<span id="cb12-10"><a href="#cb12-10"></a><span class="co">// Usage:</span></span>
<span id="cb12-11"><a href="#cb12-11"></a><span class="va">$post</span> <span class="op">=</span> <span class="cn">P</span>ost::find(<span class="dv">1</span>)<span class="ot">;</span></span>
<span id="cb12-12"><a href="#cb12-12"></a><span class="va">$post</span>->delete()<span class="ot">;</span> <span class="co">// Sets deleted_at timestamp, but doesn't actually delete the record</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent#soft-deleting">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="events">Events</h2>
<ul>
<li>Listen for events during model creation, updating, or deleting</li>
<li>Can be useful for additional logging or notifications</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb13"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb13-1"><a href="#cb13-1"></a><span class="kw">class</span> <span class="cn">U</span>ser <span class="kw">extends</span> <span class="cn">M</span>odel</span>
<span id="cb13-2"><a href="#cb13-2"></a>{</span>
<span id="cb13-3"><a href="#cb13-3"></a> <span class="kw">protected</span> <span class="kw">static</span> <span class="kw">function</span> boot()</span>
<span id="cb13-4"><a href="#cb13-4"></a> {</span>
<span id="cb13-5"><a href="#cb13-5"></a> <span class="kw">parent</span>::boot()<span class="ot">;</span></span>
<span id="cb13-6"><a href="#cb13-6"></a></span>
<span id="cb13-7"><a href="#cb13-7"></a> <span class="kw">static</span>::creating(<span class="kw">function</span> (<span class="va">$user</span>) {</span>
<span id="cb13-8"><a href="#cb13-8"></a> <span class="fu">Log</span>::info(<span class="st">'User was created'</span><span class="ot">,</span> [<span class="st">'user'</span> => <span class="va">$user</span>])<span class="ot">;</span></span>
<span id="cb13-9"><a href="#cb13-9"></a> })<span class="ot">;</span></span>
<span id="cb13-10"><a href="#cb13-10"></a> }</span>
<span id="cb13-11"><a href="#cb13-11"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/eloquent#events">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="pagination">Pagination</h2>
<ul>
<li>Use the <code>paginate()</code> method to split large result sets into pages</li>
<li>Can be useful for search results or long lists</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb14"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb14-1"><a href="#cb14-1"></a><span class="va">$users</span> <span class="op">=</span> <span class="cn">U</span>ser::paginate(<span class="dv">10</span>)<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/pagination">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="query-builder">Query Builder</h2>
<ul>
<li>Use the query builder for more complex queries that aren’t supported in Eloquent</li>
<li>Can be useful for advanced filtering or grouping</li>
<li>Example:</li>
</ul>
<div class="sourceCode" id="cb15"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb15-1"><a href="#cb15-1"></a><span class="cn">DB</span>::table(<span class="st">'users'</span>)</span>
<span id="cb15-2"><a href="#cb15-2"></a> ->select(<span class="st">'users.*'</span><span class="ot">,</span> <span class="st">'departments.name as department_name'</span>)</span>
<span id="cb15-3"><a href="#cb15-3"></a> -><span class="fu">join</span>(<span class="st">'departments'</span><span class="ot">,</span> <span class="st">'users.department_id'</span><span class="ot">,</span> <span class="st">'='</span><span class="ot">,</span> <span class="st">'departments.id'</span>)</span>
<span id="cb15-4"><a href="#cb15-4"></a> ->where(<span class="st">'users.active'</span><span class="ot">,</span> <span class="kw">true</span>)</span>
<span id="cb15-5"><a href="#cb15-5"></a> ->orderBy(<span class="st">'users.name'</span><span class="ot">,</span> <span class="st">'asc'</span>)</span>
<span id="cb15-6"><a href="#cb15-6"></a> ->get()<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>More information: <a href="https://laravel.com/docs/8.x/queries">Laravel documentation</a></p>
</section>
<section class="slide level1">
<h2 id="conclusion">Conclusion</h2>
<ul>
<li>Eloquent is a powerful tool for interacting with databases in Laravel</li>
<li>Advanced features such as model scopes, polymorphic relations, and observers can help solve complex problems</li>
<li>Use query optimization techniques, caching, and the query builder for maximum performance</li>
</ul>
</section>
<section id="references" class="slide level1">
<h1>References</h1>
<ul>
<li><a href="https://laravel.com/docs">Laravel documentation</a></li>
<li><a href="https://laracasts.com">Laracasts</a></li>
<li><a href="https://symfony.com/doc/current/index.html">Symfony documentation</a></li>
</ul>
<img src="https://upload.wikimedia.org/wikipedia/commons/e/e2/SAE_Institute_Black_Logo.jpg" class="slide-logo r-stretch"><div class="footer footer-default">
<p>Vladimir Lelicanin - SAE Institute Belgrade</p>
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</section>
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