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What is the simplest way to query posts using blog_id?

I have a post type called video that holds, not surprisingly, multiple embedded videos. Each post has a different video.

I would like to display a specific video in specific locations across different sites. The video posts are on Site 1, and other sites in the network could be Site 2, Site 3, Site 4 and Site 5. All sites are in the same multisite setup.

Each video is currently being identified by matching terms in two custom taxonomies, Taxonomy A and Taxonomy B.

If all posts were on the same blog I would use this to query the right video:

$video_query = new WP_Query( array(
    'post_type' => 'video',
    'post_status' => 'publish',
    'posts_per_page' => 1,
    'no_found_rows' => true,
    'tax_query' => array(
        'relation' => 'AND',
            'taxonomy' => 'TaxA',
            'field' => 'slug',
            'terms' => $the_termA
            'taxonomy' => 'TaxB',
            'field' => 'slug',
            'terms' => $the_termB
) );

if( $video_query->have_posts() ) :
    while( $video_query->have_posts() ) :

How can I make the query only look for posts in Site A?

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2 Answers 2

up vote 4 down vote accepted

Use switch_to_blog() http://codex.wordpress.org/WPMU_Functions/switch_to_blog, do the query and then restore back using restore_current_blog()

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Awesomeness. Thanks @Ashfame! –  mattrepublic Jul 11 '11 at 22:13

switch_to_blog is not good solution, because of

This switch is to be used for internal and admin area functions. It's too expensive a query to run on the front end.

You can use this: https://github.com/ericandrewlewis/WP_Query_Multisite

Edit: it's also bad solution, because in code is used swith_to_blog...

So I think that there is no good solution. :<

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