Question

<div class="postSlideshowDots">
                <%for i in @post.images%>
                 <%=render :partial => "dots", :locals => {:image => i }%>     
                <%end%>
</div>

I would like to also pass in a variable (=0 when it goes in) to use as a counter. I had read that there was one already built in, “partialname_counter”, but that gave me an error.

Answer 1

use <%= render :partial => "dots", :collection => @post.images %>, and you will get a variable called dots_counter in the partial. You will also need to change your partial to use dots instead of image as the variable.

Finally, don’t use for..in in Ruby, it is non-idiomatic, and has some bad behavior in regards to closures and scoping. Use .each