How to create review point system for CPTs (many-to-many relationship)

As you’re in the WP ecosystem, use it. There are already lots of plugins doing “review system” https://wordpress.org/plugins/search/reviews/

Find one which match the best your need and then improve it thanks to the filters and actions you can find in the plugin chosen.

–Edit–
If you do not want to use a plugin. I think a CPT is needed only if you want in your review a note + a review.
If you only need a note (1 to 5) then a post meta updated with the number of stars clicked (note given) should do the trick.

Related Posts:

  1. Query all posts where a meta key does not exist
  2. what is the correct way to compare dates in a WP query_posts meta_query
  3. Admin Area Custom Type Search By Meta Fields Without Title & Content
  4. How can I filter posts by post_parent in the admin?
  5. How to create a mini directory in WordPress?
  6. Detect meta value changes when post is updated (post_updated)
  7. Search everything (posts, pages, tags, cpt, meta)
  8. Compare 3 custom fields and sort by oldest
  9. Can’t sort order of wp_query with 2 meta keys
  10. How to get source of custom meta image?
  11. update a post meta from a single table cell TablePress
  12. Custom Meta Boxes – Nonce Issue – Move to trash issue
  13. Displaying Meta Box Image
  14. Displaying custom posts only if custom meta box’s date is not expired
  15. Displaying Metabox value (custom post type taxonomy)
  16. get_post_meta is returning image id
  17. Custom Post Type, Saving Multiple Checkboxes
  18. Create a random unique 6 digit number as custom field for custom post type
  19. Export entries and multiple custom field meta to .csv?
  20. Metadata for a taxonomy – is there any WordPress way of doing this?
  21. Update CPT post meta with update_post_meta and cron job
  22. Insert post metadata for all posts in CPT at once if metadata no existent
  23. Display custom post type from dynamic custom field
  24. Populate dropdown from one custom post type inside another custom post type
  25. Get posts between custom dates
  26. A better way to add a meta box to custom post types
  27. post meta parameter in post custom-post-type endpoint with restapi
  28. How do I set all of a particular post meta to a value within the custom post type I’m in?
  29. Custom fields (wp_post_meta) vs Custom Table for large amount of data
  30. Storing a many to many post type relationship in post meta and keeping SQL ability for Joins
  31. Custom filter function not working with Custom post type
  32. Importing Data from a Non-WordPress database, into WP
  33. List Taxonomies: Don’t list taxonomy if it has no post – depending on custom post-meta?
  34. Can’t publish custom post type – “You are not allowed to edit this post.”
  35. Meta Data for Custom Post Type not saving
  36. Check if post with same meta value exists
  37. Filter date from post meta when date is in string format
  38. Do posts, pages and / or custom post type objects have unique ID numbers or can there be multiple objects with the same IDs?
  39. Archieve.php not loading for custom post type
  40. Get $post->ID from a URL
  41. Displaying a div from an assigned meta_value when on a page
  42. Create Array from custom post type to display a slider
  43. Values from meta-box not on $_POST
  44. Returning a custom content types with meta values
  45. Custom post type suddenly stoped working after WordPress 5 update
  46. copy images from custom field to another custom field
  47. How to show custom field on specific custom post type posts only when filled
  48. Cannot obtain custom meta information
  49. is_main_query() never called on WP 4.4
  50. How can I output WPAlchemy repeating fields meta values in my page template?
  51. Save Metabox Custom Field Value
  52. Meta box data not saving
  53. How can I get some of a posts meta data whilst it is still inserting?
  54. How to retrive Custom Post Type Meta Fields in Custom WP_Query
  55. Cannot Save MetaBox Data in Custom Post Type
  56. best way to use custom taxonomy, post type and meta in a job system
  57. Empty meta-box returns publishdate if no value is set?
  58. Say I have a tech blog, how best would I store technical specs for a phone, if i use custom post types
  59. Building tags and archive using meta from custom post type
  60. How to order custom posts by one of the custom fields value, ‘date’?
  61. Custom Meta Box with variable number of fields
  62. WordPress CPT Taxonomy Dashboard Search – How to include taxonomy in search?
  63. Custom Post Type meta data getting deleted on bulk editing taxonomies
  64. After inserting new post with wp_insert_post() the post is not visble to WP_Query, but the same WP_Query works for post inserted from wp-admin panel
  65. How can I write a function that would update any missing specific post metadata?
  66. SELECT custom post type and its meta in SQL
  67. Save data is post using php front end
  68. How to keep custom post type related information
  69. Custom attachment function not working in v5.4.2?
  70. Can’t save meta box data in WordPress using custom post types
  71. Creating a custom post type upon registration for a specific user role
  72. How to sort by multiple values in a nested WP_Query
  73. How can I use a custom template to load custom post type posts based on a post_meta value
  74. How do I create a customised table list of a custom post type (in the admin area)?
  75. How to properly get the wp_postmeta.meta_value of a custom post type in specifics?
  76. Custom Function to redirect singular post if specific meta field is empty
  77. Saving Child Terms on front end not setting parent
  78. Metaboxes in Loop
  79. Custom post type: “transition_post_status” action get title and other fields
  80. update a posts of other custom post type
  81. How do I extract the contents of a CPT’s custom field for all posts?
  82. Collect custom post in a calendar
  83. Delete custom post type metadata without deleting the post in admin area
  84. Order by post meta value gets random results
  85. How can I get the $key / $value pairs of custom fields that were added via 3rd party plugins or themes?
  86. meta query always fails even if data is correct
  87. Values inside a custom field to determine which category posts to display
  88. Display a post count from a custom metabox selection
  89. How to rewrite CPT-Permalinks the correct way (incorporating meta-box-data)?
  90. Rich Custom Field for Custom Post type not saving
  91. Custom post type submenu sorted by specific meta_key & meta_value
  92. Advanced search form with filters for custom taxonomies and custom fields
  93. Querying meta values within an array
  94. Post AND page parameter for WP function
  95. why get_post_meta is returning 0?
  96. How to display Author Profile based on Custom field value
  97. Automatically add custom taxonomy when meta value gets to a set number or beyond
  98. Display a list of posts whose meta field values are equal to the ID of the post being viewed?
  99. Check for custom field value in different post type than current one and do something
  100. I am having a problem with fetching product data in the Gutenberg block editor