Fields define the shape of the content and the user input. There are many types of fields each with its own input and type.

Although some fields have more properties here is a list of common ones that are used.

Definition

isTitle

isTitle can be used to denote which field represents the title of the document. The field set with isTitle=true is what is displayed in the CMS list view page.

Make sure the following is true when using isTitle

• It is a top-level field (it is defined in collections.fields or collections.templates.fields)
• It is only used once per collection
• required is set to true

Example of isTitle

export default defineConfig({
  //...
  schema: {
    collections: [
      {
        name: 'posts',
        label: 'Blog Posts',
        path: 'content/posts',
        format: 'mdx',
        fields: [
          {
            type: 'string',
            label: 'Title',
            name: 'title',
            isTitle: true,
            required: true,
          },
          // ... other fields
        ],
      },
    ],
  },
})

isBody

isBody can be used for "mdx", "markdown", and "md" formats. The field used for isBody = true must have type string or rich-text. When isBody is true it will save that field to the body of the document.

Example of isBody

export default defineConfig({
  //...
  schema: {
    collections: [
      {
        name: 'posts',
        label: 'Blog Posts',
        path: 'content/posts',
        format: 'mdx',
        fields: [
          {
            type: 'rich-text',
            label: 'Body of post',
            name: 'body',
            isBody: true,
          },
          //... Other fields
        ],
      },
    ],
  },
})

ui.min and ui.max

ui.max only takes effect on object field types with list: true specified. It also isn't compatible with object field types using templates. It disables the add button in the editor once at least the given number of elements have been added.

{
  type: "object",
  label: "Object List",
  name: "objectList",
  list: true,
  ui: {
    max: 3,
  },
  fields: [
    {
     //...
    },
  ]
}

ui.min will ensure that once the specified minimum number of items is added (ex: 3 in the example), users will not be able to remove items if there are only the minimum number of items.

It can apply to all field types with list list: true specified, provided they appear as a list in the editor. Specifically, this is the:

• String Field Type
• Object Field Type
• Image Field Type

{
  type: "string",
  label: "Llamas",
  name: "llamas",
  list: true,
  ui: {
    min: 3,
  }
}