title: multiple joins with slick
body: <p>For joining between two tables is done like</p>
  
  <pre><code>    (for {
      (computer, company) &lt;- Computers leftJoin Companies on (_.companyId === _.id)
      if computer.name.toLowerCase like filter.toLowerCase()
      }
  </code></pre>
  
  <p>But in case if joining required between more tables what is the right way trying below but doesnt work</p>
  
  <pre><code>   (for {
      (computer, company,suppliers) &lt;- Computers leftJoin Companies on (_.companyId ===        _.id)
       //not right leftjoin Suppliers on (_.suppId === _.id)
      if computer.name.toLowerCase like filter.toLowerCase()
    }
  </code></pre>