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31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
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{
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"name": "is_attribute_valid",
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"type": "function",
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"groups": ["Record and Attributes"],
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"description": "Returns TRUE if a specific feature attribute meets all constraints.",
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"arguments": [{
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"arg": "attribute",
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"description": "an attribute name"
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},{
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"arg": "feature",
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"description": "A feature. If not set, the feature attached to the expression context will be used.",
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"optional": true
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},{
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"arg": "layer",
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"description": "A vector layer. If not set, the layer attached to the expression context will be used.",
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"optional": true
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},{
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"arg": "strength",
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"description": "Set to 'hard' or 'soft' to narrow down to a specific constraint type. If not set, the function will return FALSE if either a hard or a soft constraint fails.",
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"optional": true
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}],
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"examples": [{
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"expression": "is_attribute_valid('HECTARES')",
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"returns": "TRUE"
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}, {
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"expression": "is_attribute_valid('HOUSES',get_feature('my_layer', 'FID', 10), 'my_layer')",
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"returns": "FALSE"
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}],
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"tags": ["constraints", "hard", "soft"]
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}
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