Context Validation

2013-02-23 - Proposal Draft

Specification

This is an extension to the core validation spec.

Condition Nodes

• operator
  • The operator to be used for the condition
• value
  • The value to be used for the condition
• nulls
  • A boolean denoting whether to include/exclude NULL values if they are allowed for the field.

Branch Nodes

Branch nodes act as containers for nesting relationship between nodes and are not associated to specific Field or Concept instances. Therefore only the two attributes below are required.

• children
  • A list of of nodes (condition or branch)
• type
  • The logical relationship between the nodes in the children list, either or or and.

Warnings

• VALUE_OUT_OF_RANGE
  • Applies to numerical values that are greater than the max or less than the min
• VALUE_NOT_A_CHOICE
  • Applies to enumerable or key-based data where the value is not in the set
• VALUE_NOT_NULLABLE
  • Applies to all fields. If a value does not allow NULL values to be stored, but the query is filtering by them, no data will be returned.
• SINGLE_NODE_BRANCH
  • Applies to branch nodes that only contain a single node which deems the branch unnecessary. The client should replace the branch node with the single condition.
• EMPTY_BRANCH
  • Applies when a branch contains no child nodes

Errors

• INVALID_VALUE
  • The value is of the wrong type or format
• INVALID_OPERATOR
  • The operator supplied is not valid for the field
• INVALID_OPERATOR_FOR_VALUE
  • The combination of operator and value are invalid, e.g. a range query with a single value

Examples

Condition Node

{
    'concept': 4,
    'field': 39,
    'value': 54,
    'operator': 'gt',
    'nulls': False,
    'language': 'Pure Tone Average (PTA) is greater than 54',
    'enabled': False,
    'errors': ('Value out of range',)
}

Branch Node

{
    'type': 'or',
    'children': [{ ... }, { ... }]
}