WP_Query only returns posts that match first term in tax_query array

Hi!

I had the same problem described here and I found the real solution.

The problem is if you put multiple terms for one taxonomy, you need to add “relation = OR” to the query:

Array
(
    [post_type] => Array
        (
            [0] => event
        )

    [post_status] => publish
    [posts_per_page] => -1
    [orderby] => title
    [order] => ASC
    [tax_query] => Array
        (
            [relation] => OR
            [0] => Array
                (
                    [taxonomy] => event-type
                    [field] => slug
                    [operator] => IN
                    [terms] => Array
                        (
                            [0] => walk
                            [1] => talk
                            [2] => workshop
                        )

                )

        )

)

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