getting error no implicit conversion of sequel <p>how to do below query in ruby sequel </p> <pre><code>table1.column1 = concat('a' + table2.column2 + 'b') </code></pre> <p>without 'a' </p> <pre><code>sequel.qualify(:table1, :column1) = concat(sequel.qualify(:table2, :column2) + 'b') </code></pre> <p>wokring properly.when adding 'a' also getting </p> <blockquote> <p>TypeError: no implicit conversion of Sequel::SQL::StringExpression into String /root/test/test.rb:13:in `+'</p> </blockquote>