Summary String Transformations

You can apply transformations on fields in a summary string template using filter notation syntax.

Example config:

collections:
  - name: "posts"
    label: "Posts"
    folder: "_posts"
    summary: "{{title | upper}} - {{date | date('YYYY-MM-DD')}} – {{body | truncate(20, '***')}}"
    fields:
      - { label: "Title", name: "title", widget: "string" }
      - { label: "Publish Date", name: "date", widget: "datetime" }
      - { label: "Body", name: "body", widget: "markdown" }

The above config will transform the title field to uppercase and format the date field using YYYY-MM-DD format. Available transformations are upper, lower, date('<format>'), default('defaultValue'), ternary('valueForTrue','valueForFalse') and truncate(<number>)/truncate(<number>, '<string>')