<p></p>
<p dir="auto">Maybe something along the lines of this?</p>
<div class="highlight highlight-source-ruby" dir="auto"><pre class="notranslate"><span class="pl-k">def</span> <span class="pl-smi">self</span><span class="pl-kos">.</span><span class="pl-en">embedDefinitions</span><span class="pl-kos">(</span><span class="pl-s1">layers_filename</span><span class="pl-kos">)</span>
  <span class="pl-smi">self</span><span class="pl-kos">.</span><span class="pl-en">definitions</span><span class="pl-kos">(</span><span class="pl-s1">layers_filename</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">select</span> <span class="pl-kos">{</span> |<span class="pl-s1">entry</span>| <span class="pl-s1">entry</span><span class="pl-kos">[</span><span class="pl-s">"canEmbed"</span><span class="pl-kos">]</span> <span class="pl-kos">}</span>
    <span class="pl-kos">.</span><span class="pl-en">each_with_object</span><span class="pl-kos">(</span><span class="pl-kos">{</span><span class="pl-kos">}</span><span class="pl-kos">)</span> <span class="pl-k">do</span> |<span class="pl-s1">entry</span><span class="pl-kos">,</span> <span class="pl-s1">obj</span>|
      <span class="pl-s1">obj</span><span class="pl-kos">[</span><span class="pl-s1">entry</span><span class="pl-kos">[</span><span class="pl-s">"layerId"</span><span class="pl-kos">]</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-kos">{</span>
        <span class="pl-pds">layer</span>: <span class="pl-s1">entry</span><span class="pl-kos">[</span><span class="pl-s">"leafletOsmId"</span><span class="pl-kos">]</span><span class="pl-kos">,</span>
        <span class="pl-pds">darkLayer</span>: <span class="pl-s1">entry</span><span class="pl-kos">[</span><span class="pl-s">"leafletOsmDarkId"</span><span class="pl-kos">]</span><span class="pl-kos">,</span>
        <span class="pl-pds">apikey</span>: <span class="pl-s1">entry</span><span class="pl-kos">[</span><span class="pl-s">"apikey"</span><span class="pl-kos">]</span>
      <span class="pl-kos">}</span><span class="pl-kos">.</span><span class="pl-en">compact</span>
    <span class="pl-k">end</span>
<span class="pl-k">end</span></pre></div>
<p dir="auto">But I'm no ruby expert</p>

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