Get posts in taxonomy randomly

You have syntax error in tax_query. 

'tax_query' => array(
    array (
        'taxonomy'      => $term->taxonomy,
        'field'         => 'term_id', // this is default value, so can be ommited
        'terms'         => $term->term_id,
    )
)

As you can read in Codex, possible values for field parameter are: term_id (default), name, slug or term_taxonomy_id.

In this question you can read about another method of getting a random post.

Related Posts:

  1. Why is my WP_Query not working when tax_query terms are an array?
  2. How to add terms to my tax_query based off of the current post
  3. Is it possible to dynamically get queried term AND taxonomy?
  4. WP_Query tax query part of slug
  5. Taxonomy Query Relation field not behaving correctly?
  6. Loop posts based on permalink term
  7. Show multiple tax_query from 2 or more post_type in a single code
  8. WP Query should show No Posts when tax_query $args taxonomies don’t have associated posts
  9. wp_query with meta_query and tax_query
  10. How can I get all the posts that are related with a specific taxonomy term?
  11. Custom taxonomy and query multi conditions
  12. Empty ‘terms’ in ‘tax_query’ returns an empty array
  13. Get the tax term in which is a post via wp_query
  14. Custom query for certain post type OR another post type with a certain category
  15. WordPress tax_query “and” operator not functioning as desired
  16. Search custom taxonomy term by name
  17. Escaping WP_Query tax_query when term has special character(s)
  18. How to display post from current Taxonomy in archive page?
  19. How to stop wordpress to make the default query?
  20. $wp_query initiation?
  21. Display posts the match taxonomy term linked from wp_list_categoies?
  22. WooCommerce: filter by parent product’s taxonomy and product variation’s meta data
  23. How to combine tax_query and date_query in WordPress
  24. Querying by taxonomy vs Querying by Custom fields Speed Comparison
  25. Using tax_query reverses my post_type argument in a custom WP_Query
  26. WP Query for Posts (Products) in Specific Category that has 2 Specific Tags (*AND* both tags not *OR*)
  27. tax_query shows no results if nothing is selected
  28. get complex results set according to category structure
  29. WP_Query tax_query problem
  30. Filtering posts by custom field value not working
  31. Order taxonomy terms in alphabetical order
  32. Empty tax_query array returns an empty array
  33. How do I search inside specific taxonomies in WordPress
  34. Pass array of taxonomy terms to wp_query
  35. Formulate a url to show posts with both taxonomy terms
  36. tax_query: Order by slug?
  37. Taxonomy search/filter with multiple taxonomies and multiple taxonomy terms
  38. Output an array of terms for a ‘tax_query’ => array()
  39. Querying on multiple taxonomies pulled from $_GET checkbox array not working?
  40. WP_Query Not Recognizing Taxonomy Parameter in Custom Search
  41. Return Taxonomy/Term Information with Posts (WP_Query/get_posts)
  42. Advanced Taxonomy Queries WordPress
  43. WP Query Args – Title or Taxonomy Value
  44. Slow queries on a huge database
  45. wp_query args adding muitiple tax_querys
  46. Automatically Query Parent Taxonomy
  47. How Can I Change The Tax Query For The Main Loop For Taxonomy Archives?
  48. Is there a better way to pull in custom content without querying posts?
  49. Query with meta_query and tax_query together not working properly
  50. Custom taxonomy.php not working
  51. Adding a tax_query to a WP_Query Object
  52. WP_Query for a taxonomy with different taxonomy types
  53. Finding WordPress Posts assigned to multiple categories
  54. Order or Orderby in tax_query (How to define order of terms in WP_Query)
  55. Using custom taxonomies in a query
  56. How to Order a list of taxonomies? orderby?
  57. How to add custom meta to ‘pre_get_terms’?
  58. Get Child Category only
  59. How to add tax_query to $args with concatenation
  60. How to search for meta_query LIKE or tax_query LIKE and grab these posts on search results?
  61. Function using get_posts() with tax_query not working when called from functions.php
  62. Tax_Query using WP_Query not working
  63. Custom taxonomy in WP_Query not working
  64. How to stack name list in non-alphabetical order?
  65. Can’t get term id for category archive
  66. How to make a post with certain taxonomy term display first before other post with only one query?
  67. Any quicker alternative for WP_Query “NOT IN”
  68. Tax Query on product_cat using NOT IN as operator does not exclude that category
  69. Use get_cat_ID to retreive multiple category IDs
  70. How can I order a post query’s results based on the number of matching taxonomy terms?
  71. Only show tag with the same id as the post
  72. How to use the Term Object from a custom select field in a query
  73. WP_Query for a taxonomy value OR a custom post type meta field
  74. WP_Query paginate with one term per page?
  75. Select multiple categories with is_tax
  76. list all post who have mutual taxonomy as current taxonomy!
  77. Taxonomy archive, categorised by other taxonomy, not hiding empty taxonomies
  78. pages shortcode filtering by category
  79. WordPress tax_query ignoring relation OR
  80. How to show terms from another taxonomy
  81. Taxonomy Terms That Don’t Exist Display Results
  82. display all posts from category with and without terms in chronological order
  83. Search Filter With Custom Taxonomy and Custom Fields : How do I handle it via plugin?
  84. In Product Category archives how to show Posts having same/similar prod_cat slug structure?
  85. Category Archive not working for pages
  86. How to combine nested tax_query logic with other nested query logic?
  87. WP Query with sticky posts and tax_query
  88. tax_query not working for taxonomy slug
  89. Extending WP Query: Custom geolocation meta values work, but tax_query breaks
  90. Custom query for tag and custom tag from 2 post type
  91. Search format not matching taxonomy query
  92. List posts of terms but exclude one term
  93. Passing query variables to a custom page template
  94. How to use tax_query other than by slug or id or solve custom taxonomy tags conflicts with pre-existing tags?
  95. Advanced AND tax_query in sidebar with 2 taxonomies
  96. Output ACF field dynamicaly within a taxonomy loop [closed]
  97. tax_query not working properly with get_posts
  98. How can I get taxonomy term name using term slug & post ID using build in WordPress function or class?
  99. on attachment.php, how to display previous and next attachment links that follow the same order as a custom WP Query
  100. Using WP Query, I want to include all posts in category 1 as long as they are not also in category 2
tech