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<code>lock_tables</code> now takes a <code>session_maker</code> instead of a <code>session</code>
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<h1 id="migrating-to-v40">Migrating to v4.0<a class="headerlink" href="#migrating-to-v40" title="Permanent link">&para;</a></h1>
<p>This page covers every breaking change introduced in <strong>v4.0</strong> and the steps required to update your code.</p>
<hr />
<h2 id="database">Database<a class="headerlink" href="#database" title="Permanent link">&para;</a></h2>
<h3 id="lock_tables-now-takes-a-session_maker-instead-of-a-session"><code>lock_tables</code> now takes a <code>session_maker</code> instead of a <code>session</code><a class="headerlink" href="#lock_tables-now-takes-a-session_maker-instead-of-a-session" title="Permanent link">&para;</a></h3>
<p>The first argument of <code>lock_tables</code> changed from an <code>AsyncSession</code> instance to an <code>async_sessionmaker</code>.
The function creates and manages its own <strong>dedicated session</strong> internally, yielding it to the caller.</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Before (<code>v3</code>)</label><label for="__tabbed_1_2">Now (<code>v4</code>)</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="language-python highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.db</span><span class="w"> </span><span class="kn">import</span> <span class="n">lock_tables</span><span class="p">,</span> <span class="n">LockMode</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="k">async</span> <span class="k">with</span> <span class="n">lock_tables</span><span class="p">(</span><span class="n">session</span><span class="o">=</span><span class="n">session</span><span class="p">,</span> <span class="n">tables</span><span class="o">=</span><span class="p">[</span><span class="n">User</span><span class="p">,</span> <span class="n">Account</span><span class="p">]):</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> <span class="n">user</span> <span class="o">=</span> <span class="k">await</span> <span class="n">UserCrud</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="p">[</span><span class="n">User</span><span class="o">.</span><span class="n">id</span> <span class="o">==</span> <span class="mi">1</span><span class="p">])</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> <span class="n">user</span><span class="o">.</span><span class="n">balance</span> <span class="o">+=</span> <span class="mi">100</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="c1"># With a custom lock mode</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="k">async</span> <span class="k">with</span> <span class="n">lock_tables</span><span class="p">(</span><span class="n">session</span><span class="o">=</span><span class="n">session</span><span class="p">,</span> <span class="n">tables</span><span class="o">=</span><span class="p">[</span><span class="n">Order</span><span class="p">],</span> <span class="n">mode</span><span class="o">=</span><span class="n">LockMode</span><span class="o">.</span><span class="n">EXCLUSIVE</span><span class="p">):</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="k">await</span> <span class="n">process_order</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">order_id</span><span class="p">)</span>
</span></code></pre></div>
</div>
<div class="tabbed-block">
<div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.db</span><span class="w"> </span><span class="kn">import</span> <span class="n">lock_tables</span><span class="p">,</span> <span class="n">LockMode</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="k">async</span> <span class="k">with</span> <span class="n">lock_tables</span><span class="p">(</span><span class="n">session_maker</span><span class="o">=</span><span class="n">session_maker</span><span class="p">,</span> <span class="n">tables</span><span class="o">=</span><span class="p">[</span><span class="n">User</span><span class="p">,</span> <span class="n">Account</span><span class="p">])</span> <span class="k">as</span> <span class="n">session</span><span class="p">:</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> <span class="n">user</span> <span class="o">=</span> <span class="k">await</span> <span class="n">UserCrud</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="p">[</span><span class="n">User</span><span class="o">.</span><span class="n">id</span> <span class="o">==</span> <span class="mi">1</span><span class="p">])</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> <span class="n">user</span><span class="o">.</span><span class="n">balance</span> <span class="o">+=</span> <span class="mi">100</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="c1"># With a custom lock mode</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="k">async</span> <span class="k">with</span> <span class="n">lock_tables</span><span class="p">(</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a> <span class="n">session_maker</span><span class="o">=</span><span class="n">session_maker</span><span class="p">,</span> <span class="n">tables</span><span class="o">=</span><span class="p">[</span><span class="n">Order</span><span class="p">],</span> <span class="n">mode</span><span class="o">=</span><span class="n">LockMode</span><span class="o">.</span><span class="n">EXCLUSIVE</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="p">)</span> <span class="k">as</span> <span class="n">session</span><span class="p">:</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a> <span class="k">await</span> <span class="n">process_order</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">order_id</span><span class="p">)</span>
</span></code></pre></div>
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