Constraints

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Field-Level Constraints

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).

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Required Constraint

Required Constraints indicate that the given field must be provided with a non-null value.

// within the context of a create Workbook API call
 "fields": [
  {
    "key": "firstName",
    "type": "string",
    "label": "First Name",
    "constraints": [
      {
        "type": "required"
      }
    ]
  }
]

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Unique Constraint

Unique Constraints indicate that the given field value must only appear once in all the values for that field.

// within the context of a create Workbook API call
 "fields": [
  {
    "key": "internalCustomerId",
    "type": "number",
    "label": "Internal Customer Id",
    "constraints": [
      {
        "type": "unique"
      }
    ]
  }
]

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Computed Value

You might notice a ComputedValue type within the Blueprint code. Please do not use this value at this time as it is unsupported and may be deprecated without notice.

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Sheet-Level

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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"
      }
    ],
  }
]