resources.yml

---
collections:
- category: Content
  folder: content/resources
  label: Resources
  name: resource
  fields:
  - {
    label: Title
    name: title
    required: true
    widget: string
    } 
  - {
    label: Description
    name: description
    widget: markdown
    minimal: true
    } 
  - {
    label: File Type
    name: filetype
    required: true
    widget: select
    options:
    - Image
    - Video
    - Document
    - Other
    }
  - {
    label: File
    name: file
    widget: file
    }
 
 # show the field below only if the type of resource is "image"
 - {
    label:  Image Metadata
    name: metadata
    widget: object
    condition: {field: filetype, equals: Image}
    fields: 
      - {
         label: Text alternative
         name: image-alt
         widget: string
        }
      - {
         label: Caption
         name: caption
         widget: string
        }
      - {
         label: Credit
         name: credit
         widget: text
        }
   }