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<h1 class="post-title-main">Usage of Request_ID</h1>
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<p>Several message-calls use <code class="language-plaintext highlighter-rouge">:id</code>, <code class="language-plaintext highlighter-rouge">:ticker_id</code> or <code class="language-plaintext highlighter-rouge">:request_id</code> to distinguish between separate requests.<br />
You can either specify the <code class="language-plaintext highlighter-rouge">id</code> or delegate it to <strong><em>IB-Ruby</em></strong>.</p>
<p>To delegate, just omit the specification of an <code class="language-plaintext highlighter-rouge">:id</code> of any kind.</p>
<div class="language-ruby highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="no">C</span><span class="p">.</span><span class="nf">send_message</span> <span class="ss">:RequestContractData</span><span class="p">,</span> <span class="ss">contract: </span><span class="no">IB</span><span class="o">::</span><span class="no">Symbols</span><span class="o">::</span><span class="no">Stocks</span><span class="p">.</span><span class="nf">aapl</span>
<span class="o">=></span> <span class="mi">171</span>
<span class="mo">06</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mf">31.555</span> <span class="no">Got</span> <span class="n">message</span> <span class="mi">10</span> <span class="p">(</span><span class="no">IB</span><span class="o">::</span><span class="no">Messages</span><span class="o">::</span><span class="no">Incoming</span><span class="o">::</span><span class="no">ContractData</span><span class="p">)</span>
<span class="no">I</span><span class="p">,</span> <span class="p">[</span><span class="mi">2018</span><span class="o">-</span><span class="mo">03</span><span class="o">-</span><span class="mi">22</span><span class="no">T06</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mf">31.556812</span> <span class="vg">$1969</span><span class="p">]</span> <span class="no">INFO</span> <span class="o">--</span> <span class="p">:</span> <span class="o"><</span><span class="no">Stock</span><span class="p">:</span> <span class="no">AAPL</span> <span class="no">USD</span><span class="o">></span>
<span class="mo">06</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mf">31.557</span> <span class="no">Got</span> <span class="n">message</span> <span class="mi">52</span> <span class="p">(</span><span class="no">IB</span><span class="o">::</span><span class="no">Messages</span><span class="o">::</span><span class="no">Incoming</span><span class="o">::</span><span class="no">ContractDataEnd</span><span class="p">)</span>
<span class="no">I</span><span class="p">,</span> <span class="p">[</span><span class="mi">2018</span><span class="o">-</span><span class="mo">03</span><span class="o">-</span><span class="mi">22</span><span class="no">T06</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mf">31.557438</span> <span class="vg">$1969</span><span class="p">]</span> <span class="no">INFO</span> <span class="o">--</span> <span class="p">:</span> <span class="o"><</span><span class="no">ContractDataEnd</span><span class="p">:</span> <span class="n">request_id</span> <span class="mi">171</span> <span class="o">></span>
</code></pre></div></div>
<p>The <code class="language-plaintext highlighter-rouge">:send_message</code>-method returns the generated »request_id«. The corresponding <code class="language-plaintext highlighter-rouge">:ContractDataEnd</code> message finishes the request.</p>
<p>If you want to control the <code class="language-plaintext highlighter-rouge">:request_id</code>, just specify it. The autogeneration mechanism is simply overridden.</p>
<div class="language-ruby highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="no">C</span><span class="p">.</span><span class="nf">send_message</span> <span class="ss">:RequestContractData</span><span class="p">,</span> <span class="ss">contract: </span><span class="no">IB</span><span class="o">::</span><span class="no">Symbols</span><span class="o">::</span><span class="no">Stocks</span><span class="p">.</span><span class="nf">aapl</span><span class="p">,</span> <span class="ss">:id</span> <span class="o">=></span> <span class="mi">456</span>
<span class="o">=></span> <span class="mi">456</span>
<span class="mo">06</span><span class="p">:</span><span class="mi">26</span><span class="p">:</span><span class="mf">53.247</span> <span class="no">Got</span> <span class="n">message</span> <span class="mi">10</span> <span class="p">(</span><span class="no">IB</span><span class="o">::</span><span class="no">Messages</span><span class="o">::</span><span class="no">Incoming</span><span class="o">::</span><span class="no">ContractData</span><span class="p">)</span>
<span class="no">I</span><span class="p">,</span> <span class="p">[</span><span class="mi">2018</span><span class="o">-</span><span class="mo">03</span><span class="o">-</span><span class="mi">22</span><span class="no">T06</span><span class="p">:</span><span class="mi">26</span><span class="p">:</span><span class="mf">53.248262</span> <span class="vg">$1969</span><span class="p">]</span> <span class="no">INFO</span> <span class="o">--</span> <span class="p">:</span> <span class="o"><</span><span class="no">Stock</span><span class="p">:</span> <span class="no">AAPL</span> <span class="no">USD</span><span class="o">></span>
<span class="mo">06</span><span class="p">:</span><span class="mi">26</span><span class="p">:</span><span class="mf">53.248</span> <span class="no">Got</span> <span class="n">message</span> <span class="mi">52</span> <span class="p">(</span><span class="no">IB</span><span class="o">::</span><span class="no">Messages</span><span class="o">::</span><span class="no">Incoming</span><span class="o">::</span><span class="no">ContractDataEnd</span><span class="p">)</span>
<span class="no">I</span><span class="p">,</span> <span class="p">[</span><span class="mi">2018</span><span class="o">-</span><span class="mo">03</span><span class="o">-</span><span class="mi">22</span><span class="no">T06</span><span class="p">:</span><span class="mi">26</span><span class="p">:</span><span class="mf">53.248435</span> <span class="vg">$1969</span><span class="p">]</span> <span class="no">INFO</span> <span class="o">--</span> <span class="p">:</span> <span class="o"><</span><span class="no">ContractDataEnd</span><span class="p">:</span> <span class="n">request_id</span> <span class="mi">456</span> <span class="o">></span>
</code></pre></div></div>
<h2 id="examples-using-this-feature">Examples using this feature</h2>
<ul>
<li><a href="https://github.com/ib-ruby/ib-examples/blob/main/contract/contract_details">contract details</a></li>
<li><a href="https://github.com/ib-ruby/ib-examples/blob/main/contract/historic-data">historic data</a></li>
<li><a href="https://github.com/ib-ruby/ib-examples/blob/main/contract/option_data">option data</a></li>
<li><a href="https://github.com/ib-ruby/ib-examples/blob/main/contract/option-greeks">option-greeks</a></li>
</ul>
<h2 id="list-of-messages-supporting-auto-generated-request_ids">List of Messages supporting auto-generated request_id’s</h2>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>:RequestAccountSummary
:RequestPositionsMulti
:RequestAccountUpdatesMulti
:RequestContractDetails = :RequestContractData
:RequestExecutions
:RequestFundamentalData
:RequestHeadTimeStamp
:RequestHistogramData
:RequestHistoricalData
:RequestRealTimeBars
:RequestCalculateImpliedVolatility = :CalculateImpliedVolatility
= :RequestImpliedVolatility
:RequestCalculateOptionPrice = :CalculateOptionPrice
= :RequestOptionPrice
:RequestScannerSubscription
:RequestSecurityDefinitionOptionParameters = :ReqSecDefOptParams
= :RequestOptionChainDefinition
</code></pre></div></div>
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