WP_Query changes post_type on its own.

[23kulpamens]

The code of the test )this is in bbpress - bbpress/includes/topics/template.php:206:

var_dump($r);
$bbp->topic_query = new WP_Query( $r );
var_dump($bbp->topic_query);

And results of the test:

array(11) {
  ["post_type"]=>
  string(5) "topic"
  ["post_parent"]=>
  int(4514)
  ["meta_key"]=>
  string(21) "_bbp_last_active_time"
  ["orderby"]=>
  string(10) "meta_value"
  ["order"]=>
  string(4) "DESC"
  ["posts_per_page"]=>
  int(10)
  ["paged"]=>
  int(1)
  ["s"]=>
  bool(false)
  ["show_stickies"]=>
  bool(true)
  ["max_num_pages"]=>
  bool(false)
  ["perm"]=>
  string(8) "readable"
}
object(WP_Query)#292 (46) {
  ["query_vars"]=>
  array(65) {
    ["post_type"]=>
    string(4) "post"
    ["post_parent"]=>
    int(4514)
    ["meta_key"]=>
    string(21) "_bbp_last_active_time"
    ["orderby"]=>
    string(10) "meta_value"
    ["order"]=>
    string(4) "DESC"
    ["posts_per_page"]=>
    int(10)
    ["paged"]=>
    int(1)
    ["s"]=>
    bool(false)
    ["show_stickies"]=>
    bool(true)
    ["max_num_pages"]=>
    bool(false)
    ["perm"]=>
    string(8) "readable"
    ["error"]=>
    string(0) ""
    ["m"]=>
    string(0) ""
    ["p"]=>
    int(0)
    ["subpost"]=>
    string(0) ""
    ["subpost_id"]=>
    string(0) ""
    ["attachment"]=>
    string(0) ""
    ["attachment_id"]=>
    int(0)
    ["name"]=>
    string(0) ""
    ["static"]=>
    string(0) ""
    ["pagename"]=>
    string(0) ""
    ["page_id"]=>
    int(0)
    ["second"]=>
    string(0) ""
    ["minute"]=>
    string(0) ""
    ["hour"]=>
    string(0) ""
    ["day"]=>
    int(0)
    ["monthnum"]=>
    int(0)
    ["year"]=>
    int(0)
    ["w"]=>
    int(0)
    ["category_name"]=>
    string(0) ""
    ["tag"]=>
    string(0) ""
    ["cat"]=>
    string(0) ""
    ["tag_id"]=>
    string(0) ""
    ["author"]=>
    string(0) ""
    ["author_name"]=>
    string(0) ""
    ["feed"]=>
    string(0) ""
    ["tb"]=>
    string(0) ""
    ["comments_popup"]=>
    string(0) ""
    ["meta_value"]=>
    string(0) ""
    ["preview"]=>
    string(0) ""
    ["sentence"]=>
    string(0) ""
    ["fields"]=>
    string(0) ""
    ["menu_order"]=>
    string(0) ""
    ["category__in"]=>
    array(0) {
    }
    ["category__not_in"]=>
    array(0) {
    }
    ["category__and"]=>
    array(0) {
    }
    ["post__in"]=>
    array(0) {
    }
    ["post__not_in"]=>
    array(0) {
    }
    ["tag__in"]=>
    array(0) {
    }
    ["tag__not_in"]=>
    array(0) {
    }
    ["tag__and"]=>
    array(0) {
    }
    ["tag_slug__in"]=>
    array(0) {
    }
    ["tag_slug__and"]=>
    array(0) {
    }
    ["post_parent__in"]=>
    array(0) {
    }
    ["post_parent__not_in"]=>
    array(0) {
    }
    ["author__in"]=>
    array(0) {
    }
    ["author__not_in"]=>
    array(0) {
    }
    ["ignore_sticky_posts"]=>
    bool(false)
    ["suppress_filters"]=>
    bool(false)
    ["cache_results"]=>
    bool(true)
    ["update_post_term_cache"]=>
    bool(true)
    ["update_post_meta_cache"]=>
    bool(true)
    ["nopaging"]=>
    bool(false)
    ["comments_per_page"]=>
    string(2) "50"
    ["no_found_rows"]=>
    bool(false)
  }
  ["tax_query"]=>
  object(WP_Tax_Query)#3710 (6) {
    ["queries"]=>
    array(0) {
    }
    ["relation"]=>
    string(3) "AND"
    ["table_aliases:protected"]=>
    array(0) {
    }
    ["queried_terms"]=>
    array(0) {
    }
    ["primary_table"]=>
    string(8) "wp_posts"
    ["primary_id_column"]=>
    string(2) "ID"
  }
  ["meta_query"]=>
  object(WP_Meta_Query)#3706 (7) {
    ["queries"]=>
    array(2) {
      [0]=>
      array(1) {
        ["key"]=>
        string(21) "_bbp_last_active_time"
      }
      ["relation"]=>
      string(2) "OR"
    }
    ["relation"]=>
    string(3) "AND"
    ["meta_table"]=>
    string(11) "wp_postmeta"
    ["meta_id_column"]=>
    string(7) "post_id"
    ["primary_table"]=>
    string(8) "wp_posts"
    ["primary_id_column"]=>
    string(2) "ID"
    ["table_aliases:protected"]=>
    array(1) {
      [0]=>
      string(11) "wp_postmeta"
    }
  }
  ["date_query"]=>
  bool(false)
  ["post_count"]=>
  int(0)
  ["current_post"]=>
  int(-1)
  ["in_the_loop"]=>
  bool(false)
  ["comment_count"]=>
  int(0)
  ["current_comment"]=>
  int(-1)
  ["found_posts"]=>
  int(0)
  ["max_num_pages"]=>
  int(0)
  ["max_num_comment_pages"]=>
  int(0)
  ["is_single"]=>
  bool(false)
  ["is_preview"]=>
  bool(false)
  ["is_page"]=>
  bool(false)
  ["is_archive"]=>
  bool(true)
  ["is_date"]=>
  bool(false)
  ["is_year"]=>
  bool(false)
  ["is_month"]=>
  bool(false)
  ["is_day"]=>
  bool(false)
  ["is_time"]=>
  bool(false)
  ["is_author"]=>
  bool(false)
  ["is_category"]=>
  bool(false)
  ["is_tag"]=>
  bool(false)
  ["is_tax"]=>
  bool(false)
  ["is_search"]=>
  bool(true)
  ["is_feed"]=>
  bool(false)
  ["is_comment_feed"]=>
  bool(false)
  ["is_trackback"]=>
  bool(false)
  ["is_home"]=>
  bool(false)
  ["is_404"]=>
  bool(false)
  ["is_comments_popup"]=>
  bool(false)
  ["is_paged"]=>
  bool(false)
  ["is_admin"]=>
  bool(false)
  ["is_attachment"]=>
  bool(false)
  ["is_singular"]=>
  bool(false)
  ["is_robots"]=>
  bool(false)
  ["is_posts_page"]=>
  bool(false)
  ["is_post_type_archive"]=>
  bool(true)
  ["query_vars_hash:private"]=>
  string(32) "40130020a8a2a2f88b4b44834d315300"
  ["query_vars_changed:private"]=>
  bool(true)
  ["thumbnails_cached"]=>
  bool(false)
  ["stopwords:private"]=>
  NULL
  ["query"]=>
  array(11) {
    ["post_type"]=>
    string(5) "topic"
    ["post_parent"]=>
    int(4514)
    ["meta_key"]=>
    string(21) "_bbp_last_active_time"
    ["orderby"]=>
    string(10) "meta_value"
    ["order"]=>
    string(4) "DESC"
    ["posts_per_page"]=>
    int(10)
    ["paged"]=>
    int(1)
    ["s"]=>
    bool(false)
    ["show_stickies"]=>
    bool(true)
    ["max_num_pages"]=>
    bool(false)
    ["perm"]=>
    string(8) "readable"
  }
  ["request"]=>
  string(467) "SELECT SQL_CALC_FOUND_ROWS  wp_posts.ID FROM wp_posts  INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) WHERE 1=1  AND wp_posts.post_parent = 4514  AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'closed' OR wp_posts.post_status = 'private' OR wp_posts.post_status = 'hidden') AND ( 
  wp_postmeta.meta_key = '_bbp_last_active_time'
) GROUP BY wp_posts.ID ORDER BY wp_postmeta.meta_value DESC LIMIT 0, 10"
  ["posts"]=>
  array(0) {
  }
}

As you can se the post_type had been changed form "topic" to "post". It is right in the WP_Query->query field, but it looks like WP_Query->query_vars is more important. It is also the reason why bbpress want to work in my case.

[boonebgorges]

Thanks for the ticket, 23kulpamens. I've never seen this specific issue with bbPress, and I'm fairly certain it's got to be a conflict with some other plugin/customization on your site (perhaps a 'pre_get_posts' callback or something like that). Can you verify that the problem exists on a WP installation with only bbPress active? If so, can you share the format of the URL you are visiting?

[23kulpamens]

You are right. There is no such change in clean install with only bbpress installed. Do you know which action hooks might cause such behavior?

[boonebgorges]

As I suggest, it's probably something like 'pre_get_posts', 'parse_query', or 'parse_request'. I'd recommend using process of elimination to narrow down the guilty plugin, and directing a support request to that plugin's author. In the meantime, I'm going to close this ticket, as it appears to be unrelated to WP core.

[23kulpamens]

Thank for all your help. I'll look deeper for solution :)