A question on init and activation hooks

I think you’re mistaken and the activation didn’t work correctly: you won’t have the new post type set up in the permalinks cache.

Here’s activate_plugin() in 5.4. You can see the sequence is

  • wp-admin/plugins.php loads without the new plugin; init is triggered now
  • activate_plugin() PHP-includes the new plugin, loading it and registering its hooks; it’s now too late for the plugin’s init hook to be called
  • activate_plugin() calls the global activate_plugin hook
  • activate_plugin() calls the plugin-specific activate hook

So if you’re relying on the init hook to register your post type in the activation case it won’t have been called before flush_rewrite_rules(). Not that you’ll see any errors here, but the new post type won’t be set up in the permalink cache.

(That all is unless, on the very off chance you have an activate_plugin hook that triggers init, but that seems unlikely and definitely isn’t the default.)

Related Posts:

  1. Is there any plugin development framework
  2. How do I add CSS options to my plugin without using inline styles?
  3. How to override existing plugin action with new action
  4. Add custom TinyMCE 4 Button, Usable since WordPress 3.9-beta1
  5. How to store username and password to API in wordpress option DB?
  6. Handling results from data hooked into admin_post
  7. How do I create links at the top of WP_List_table?
  8. Is it worth checking if class_exists when developing a plugin and how to do it?
  9. Why Does get_posts() Return an Empty Set?
  10. Get list of available wordpress actions
  11. Where to enqueue stylesheets for plugin?
  12. How can i list current author’s categories?
  13. How can the tinyMCE dom be manipulated (offical API does not seem to work)?
  14. stray elements
  15. Deletion of shared options using uninstall.php
  16. Pass javascript result to shortcode executer function
  17. Plugin Settings not Saving on Ajax re-ordered table
  18. Add Post and Comments menu no longer visible
  19. Undefined function wp_set_password
  20. WordPress password reset – why post rp_key?
  21. How to modify the new WordPress 4.5 link inline toolbar
  22. Proper way to hook wp_get_attachment_url
  23. How to install WordPress Popular Posts plugin twice?
  24. Get the link text
  25. Multisite plugin development and wp_enqueue_script
  26. Prevent plugin from deleting important directories
  27. Default category got deleted. How to get it back as ID=1?
  28. Is Dreamweaver CS5 a serious choice for theme/plugin development?
  29. What allows a template file from plugin to be copied in child theme and overridden?
  30. How to set “Site Address (URL)” programmatically on WP multisite?
  31. creating custom archive template within plugin for custom post type using archive_template filter
  32. Modify hard-coded conditionals for roles to custom roles
  33. Reset plugins version cache | pre_set_site_transient_update_plugins
  34. Add column and post filter for a custom post type field on the edit.php page
  35. Trying to understand order and frequency of action hooks firing
  36. Create & Save multiple Meta-boxes
  37. How to fetch all images from a WordPress draft using PHP?
  38. Can’t get woocommerce_get_price_html to work [closed]
  39. jQuery selectors for editor elements safe to use?
  40. parse content from wikipedia article replacing search term with the title of article
  41. Fatal error: Uncaught Error: Call to undefined function get_option()
  42. Strange Situation When Try To Retrieve Github Gist Using wp_remote_get
  43. Thickbox doesn’t respect dimensions when used in admin [duplicate]
  44. jQuery does not enqueue for my purpose… (before an inline script in the footer)
  45. Can I add custom css to an mu-plugin?
  46. Why is my plugin version 0.1?
  47. WP Plugin Running before jQuery
  48. How to include jQuery into my plugin so I can use it on plugin page?
  49. Prevent WordPress automatically processing certain URL queries
  50. insert query on a custom table using ajax with jQuery plugin Jeditable
  51. WordPress multisite,use same cookies across all website?
  52. How to check via conditional tags for a single plugin page?
  53. How to add search form in main page body?
  54. How to save post meta as an array in Gutenberg?
  55. WordPress Rest API with rest_do_request, possible race condition?
  56. Need help about understand api, wp, $ syntax in WordPress plugin script
  57. How to disable a jQuery plugin on WordPress plugin page
  58. Is it possible to use WP-CLI in a plugin (or theme)?
  59. WP_NAV_MENU filter targets all menus
  60. Load php file with jquery in single.php
  61. Restore svn trunk of my plugin repository to the initial state?
  62. Anyone using unzip_file successfully? It uploads the zip but doesn’t extract it!
  63. WP 3-way voting system: On to something! Please help!
  64. Why is the expected file not being deleted?
  65. How to determine which capability to use?
  66. How to use attributes in competent of Gutenberg
  67. How does one update complex options?
  68. How to write a custom shortcode name book?
  69. Hook to execute after deleting a Custom Taxonomy
  70. Forbidden Error in ajax call with wordpress
  71. get the term_id of current taxonomy page
  72. functions won’t fire after I converted my code from procedural code to OOP
  73. How to prevent wp_insert_post from creating a new post every second?
  74. Javascript scroll eventHandler only working when I’m logged in in WordPress
  75. CPT UI and custom database table
  76. Updating a WP Plugin SVN not showing on WordPress Website or Zip
  77. Download stopped working in 4.7.4
  78. $wpdb Mysql trigger problem
  79. Calling dynamic_sidebar in plugin gives error
  80. How to add chunk of php, html, and sql code to variable an append to $content
  81. edit-tags.php in plugin admin menu hides when is the active page
  82. WordPress postboxes On Tabbed Views and Hiding Registered Pages
  83. Best way to handle a form post in plugin
  84. grouping my widgets wordpress
  85. Yet another wp_insert_post infinite loop. What is wrong?
  86. Initialize class inside plugin
  87. Why does this fail: Disabling plugins enqueue_script() in functions.php
  88. “Print to printer” functionality in a plugin
  89. Remove text from confirmation message
  90. Which subset of html does WordPress support?
  91. Can I use an array to create multiple tables?
  92. How to set init for maximum script execution, memory limit and max files upload in wordpress
  93. Help interpreting @wordpress/create-block-tutorial-template usage error
  94. Leveraging Core Functionality in Icon Upload Plugin [closed]
  95. esc_url, esc_url_raw or sanitize_url?
  96. React Plugin Settings Page Localization
  97. Is it within WordPress guidelines to update another plugin’s database fields from my own plugin? [closed]
  98. Block Development: hamburger module throwing error in save function
  99. How can I chanage the user for the composer container in wp-env?
  100. Adding a navigation with wp_nav_menu() to a custom block in the site editor