Pastable version of Squash a collection.

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            <pre class="sunburst"><span style="color:#E28964;">def</span> <span style="color:#89BDFF;">all_shops</span>(<span style="color:#3E87E3;">products</span>)
    ids <span style="color:#E28964;">=</span> []
    products.<span style="color:#89BDFF;">collect</span> { |<span style="color:#3E87E3;">product</span>| product.<span style="color:#89BDFF;">shops</span> }.<span style="color:#89BDFF;">flatten</span>.<span style="color:#89BDFF;">reject</span> { |<span style="color:#3E87E3;">s</span>| <span style="color:#E28964;">if</span> ids.<span style="color:#89BDFF;">include?</span>(s.<span style="color:#89BDFF;">id</span>); <span style="color:#3387CC;">true</span>; <span style="color:#E28964;">else</span>; ids.<span style="color:#89BDFF;">push</span>(s.<span style="color:#89BDFF;">id</span>); <span style="color:#3387CC;">false</span>; <span style="color:#E28964;">end</span> }
<span style="color:#E28964;">end</span>
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