ACF – Query relationship without ID

If only 1 value in relation field : 

$city_id = $bnb_ville[0]->ID;

if it could be more than 1 value : 

$city_id = [];
foreach ($var as $post) {
    $city_id[] = $post->ID;
}

$bnb_ville is the variable for get_field() !

Related Posts:

  1. Filtering a WP_Query meta_query by numeric values isn’t working
  2. Automatically fill custom field value on post publish/update
  3. Filter a custom field based on selection of another custom field (ACF) [closed]
  4. ACF Relationships in Custom Post Type Permalink
  5. How to sort a table of custom posts by column containing custom field
  6. WordPress Search documentation: how to improve search query using taxonomy terms, custom meta fields?
  7. Use Custom Post Type as Custom Field
  8. Display posts if a custom field value is equal to another custom field value
  9. ACF Upload Image in repeater from front-end with custom form? – add_post_meta()
  10. Get Custom Field Values by Another Custom Field in WordPress
  11. How to Display ACF Relationship Custom Field as Link to Specific Custom Post?
  12. Query Custom Post Types by date (custom field) range
  13. Custom Post type and Custom Field WP_Query
  14. How to change post featured image using a custom field of category?
  15. Retrieve value of a category’s custom field
  16. How can I dynamically add a post to a custom post type which uses a custom field?
  17. Bulk Update Custom Fields for Custom Post Types
  18. WP_Query order by custom field, then randomly order some of results
  19. Query custom post type with ACF Date
  20. Meta Query Not Returning Output Despite Having Matching Values
  21. ACF From & To Date Validations
  22. Using advanced custom fields from one custom post type in another custom post type / using nested shortcodes
  23. How to render a custom post type template with custom fields using shortcode
  24. Order Custom Post Type by Custom Field Value
  25. Custom fields (wp_post_meta) vs Custom Table for large amount of data
  26. Multiple Frontend Filters Using Advanced Custom Fields
  27. Integrate Custom Post Type Events into Calendar
  28. Displaying custom field according to date
  29. WebP Fallback for Inline Background Image in Style Attribute
  30. Query based on custom fields start and end date
  31. How to get a custom type post data when it has a connection with another custom type post?
  32. List of users that clicked a ‘Join’ button at single post
  33. How to inherit field value from parent post into in child / sub post
  34. Custome fields not displayed
  35. posttype and custom fields on multisite
  36. How do I get_the_postID() for a custom post that uses ACF repeater field?
  37. How do I replace the post title with a custom field?
  38. Sum and count of custom field values
  39. Group by custom field value (start and end times)
  40. Custom post types, disable fields
  41. Get A Custom Field From A Custom Taxonomy Of A Custom Post Type [closed]
  42. Excerpt length: get first paragraph
  43. Having a repeating custom field in admin custom post type, what I’d go better with, for DB’s sake? ACF repeater or query a different post type?
  44. ACF – Retrieve custom taxonomy from a relationship field
  45. Create if else for post types in WP_Query ‘post__in’ values
  46. Display Custom Field or Custom Taxonomy in front page /post/product
  47. How to access repeater field of a custom field?
  48. Filter posts by their related field’s custom field
  49. filter using custom fields
  50. Autofill advanced custom field with user data
  51. Advanced search form with multiple custom fields
  52. How do I display specific custom posts, and how do I edit a post’s singular page?
  53. Fixed custom fields depending on posttype/category
  54. Automatically convert standard posts with custom fields to custom post types
  55. Can’t pick up a field created with Advanced Custom Fields
  56. Get month and day from a Date Picker custom field
  57. Setting a custom $query->query_vars[‘meta_key’] breaks the WordPress menu
  58. If i have custom post type with 5 custom fields do i have to create a new loop to reference each one?
  59. How to show animal lineage/pedigree in WordPress?
  60. Retrieve a post with its ACF repeater fields in wordpress
  61. Is it possible to specify a time interval (from, to) in ACF with date picker, or other custom field?
  62. Display ACF object field data using Elementor Custom Query
  63. Post object GUID adding http:/
  64. Custom Sort Order for Custom Post Type Taxonomy
  65. Do_Shortcode not working for Embed
  66. how to filter by last name for custom post
  67. Search that will look in custom field, post title and post content
  68. clients list using wordpress
  69. How to do a custom bookmarks post type?
  70. How do I add media to a custom post type?
  71. add_meta_box: Datepicker like the one for postdate?
  72. Custom field losing p tags on display
  73. Using posts and postmeta table to store custom Address Book Plugin data
  74. Change message given when deleting post from custom post type
  75. Building an Advanced Search (text, tags, category, custom fields) – Getting the wrong SQL query
  76. Custom fields in Permalinks?
  77. query posts and custom post type with meta key
  78. Dynamically add / duplicate custom meta in custom post types
  79. Adding Show Less/More link to Custom Post Meta
  80. How to add multiple markers on the google map, at a certain meta_key and meta_value
  81. Custom post type name and assigning custom taxonomy
  82. Building a Portfolio and need some direction
  83. CMS – User confusion when creating new page and having to select template and save first to see correct fields
  84. Orderby meta_key/meta_value not displaying anything, am I overlooking anything?
  85. Creating a custom page post type just like the original “pages” post type using CPT UI
  86. count & sum the value of custom field of the author post in dynamic posts
  87. Display a Custom Post Type with Advanced Custom Fields on Homepage
  88. Same custom post type with different ACF
  89. How to show link to product in custom fields?
  90. Ordering Post by Meta Key (Not Working)
  91. Error when moving custom post type to bin
  92. Enforce all custom posts have specific custom fields
  93. In the admin, how can you list thumbnails instead of titles for a custom post type?
  94. Showing custom post user wise with different color in wordpress
  95. Selecting posts older than the current Unix epoch timestamp
  96. Forms with multiple element types using custom post types
  97. Customizing the display of custom post types
  98. Display custom posts in checkbox list
  99. Display posts order by custom post in a dropdown menu
  100. WordPress Loop trouble with ACF [closed]