Problem: I have a Form that creates new posts in a custom post type. One of the custom fields holds a telephone number. I would like to prevent the Use from creating a post if the telephone number they submit already exists in the database as a telephone number for another post.
Solution: Use the Forms API hook cred_form_validate to inspect the submitted custom field value. Create a custom post query that also queries posts by that custom field value. If any posts are found in that query, display an error message on the telephone field.
Problem: I have a Form where Users are asked to check off several sets of checkbox custom fields. I would like to calculate how many of each type of checkbox was checked, and display the total number of checked checkboxes of each type in the post template.
Solution: Use the cred_save_data API and the Types Field API to determine which checkboxes were checked and add up the totals for each type of checkbox. Save those totals in 4 new custom fields, and display the values of those custom fields in the post template.
