This is legacy documentation maintained for backward compatibility. For the latest documentation, please refer to the current guides.

​
Field-Level

Field-level constraints allow you to indicate additional validations that will be applied to fields of a Sheet. These constraints are in addition to the implicit constraints based on types of data. (eg: String, Number) For example, a value is required for every record (RequiredConstraint), or every record must contain a unique value for the field (UniqueConstraint).

​
Required

Required Constraints indicate that the given field must be provided with a non-null value.
A null value in this case constitutes an empty cell.
// within the context of a create Workbook API call
 "fields": [
  {
    "key": "firstName",
    "type": "string",
    "label": "First Name",
    "constraints": [
      {
        "type": "required"
      }
    ]
  }
]

​
Unique

Unique Constraints indicate that the given field value must only appear once in all the values for that field.
null values will appear many times because they are not considered unique as there is no value to compare.
// within the context of a create Workbook API call
 "fields": [
  {
    "key": "internalCustomerId",
    "type": "number",
    "label": "Internal Customer Id",
    "constraints": [
      {
        "type": "unique"
      }
    ]
  }
]

​
Computed

The computed constraint hides the given field from the mapping process, so your users will not be able to map incoming columns to this field. 
// within the context of a create Workbook API call
 "fields": [
  {
    key: 'age',
    type: 'number',
    label: 'Age',
    description: "The number of years since the person's birth date",
    constraints: [
      {
        type: 'computed',
      },
    ],
  },
]

​
Sheet-Level

​
Composite Uniqueness

Composite Uniqueness is a feature where a combination of two or more fields must be unique across an entire Sheet. To implement composite uniqueness, add the following parameters to the constraints property:
  • name defines the name of the constraint
  • fields array of field keys to consider
  • type defines the type of the constraint
  • strategy defines how to determine uniqueness Can either be: concat concatenates values from each field defined inside the fields array or hash creates a sha1 hash using of the values of each field 
"sheets": [
  {
    "name": "Products",
    "description": "A list of products available for sale",
    "slug": "products",
    "constraints": [
      {
        "name": "constraint name",
        "fields": ["field_key_one", "field_key_two"],
        "type": "unique",
        "strategy": "concat"
      }
    ],
  }
]