Working with custom fields

See also: Arithmetic and formatting in date variables

You can add additional input boxes to your Butler commands by using custom fields, which are available for Rules, Card Buttons, and Due Date commands. To work with custom fields, you need to enable the Custom Fields Power-Up on your Trello board. 

Custom field variables

Note: Custom field variables are case-sensitive and need to be capitalized.

The value of a custom field can be obtained by using a variable in the form {{%Field Name}}

Examples:

  • when custom field "Start Date" is set by anyone, post comment "The Start Date custom field was set to: {{%Start Date}}"
  • when a card is moved to list "Done" by anyone, add member @{{%Tester}} to the card, and post comment "@card Task with priority {{%Priority}} was completed and is ready for testing."

The value of a custom field that is used as a trigger can be referenced by using {customfieldvalue} .

Example

when custom field "Priority" is set, for each card linked in the attachments, set custom field "Priority" to {customfieldvalue}

Custom field arithmetic

When setting the "Number" custom field, you can perform basic arithmetic operations such as addition, subtraction, multiplication, and division. You can also use numeric constants and parentheses to group arithmetic expressions.

Example:

when a card is moved to "This Week", set custom field "Total Points" to "{{%Design Points}} + {{%Dev Points}} + {{%QA Points}}"