Conditional for empty relationships field

Question

I’ve run into an issue where I need to conditionally show content if an EE relationship field is empty. However the {if relationship-field} conditional is not working. Nor is any variation of that such as {if relationship-field == ""} or {if "{relationship-field}" == ""} or {if "{relationship-field}" != ""}. No dice on any of these.

Answer 1

The solution turns out to be fairly simple and the logic can pretty much work the same. EE relationship fields let you pull the count separately from the tag pair like this:

{relationship-field:count}

So, the solution is to use that in our conditional logic:

{if "{relationship-field:count}" == ""}
    do stuff
{if:else}
    do relationship stuff
{/if}

Answer 2

Long time to add to this but...

{relationship-field}
  do relationship stuff
  {if relationship-field:no_results}
    Empty stuuf
  {/if}
{/relationship-field}

Answer 3

I would like to add the following also works:

{if "{relationship_field:count}" == 1}
Do relationship stuff
{/if}

In my case, I only want to display formatted content if there is relationship data:

{if "{bk_author:count}"=="1"}
<h5 class="small">by {bk_author backspace="2"}<a href="/author/{bk_author:url_title}">{bk_author:title}</a>, {/bk_author}
</h5>{/if}