Showing entries that only have a specific category

Question

With the category parameter in ExpressionEngine we can specify to not provide entries with a specific category category="not 1"

Is there a way to show entries that only have a specified category, for example: category="only 1"

So entries that are marked as category 1+2 will not show.

Answer 1

This may be a little bit of a rough work around but it should work for you.

Then you can use the "Entry Category Count" plugin and then run a conditional inside of your entries tag like the following:

{exp:channel:entries channel="foo" category="1"}
    {if {exp:entry_category_count entry_id="{entry_id}"} == "1"}
        ...
    {/if} 
{/exp:channel:entries}

Entry Category Count

On GitHub