Function _Constraint_Drop

src/commands/cmd_constraint.c:138–228

GRAPH.CONSTRAIN DROP UNIQUE/MANDATORY [NODE label / RELATIONSHIP type] PROPERTIES prop_count prop0, prop1...

// GRAPH.CONSTRAIN <key> DROP UNIQUE/MANDATORY [NODE label / RELATIONSHIP type] PROPERTIES prop_count prop0, prop1...
static bool _Constraint_Drop
(
	RedisModuleCtx *ctx,    // redis module context
	RedisModuleString *key, // graph key to operate on
	ConstraintType ct,      // constraint type
	GraphEntityType et,     // entity type
	const char *lbl,        // label / rel-type
	uint8_t n,              // properties count
	const char **props      // properties
) {
	bool res = true;  // optimistic
	Attribute_ID attrs[n];

	//--------------------------------------------------------------------------
	// try to get graph
	//--------------------------------------------------------------------------

	GraphContext *gc = GraphContext_Retrieve(ctx, key, false, false);
	if(!gc) {
		// graph doesn't exists
		return false;
	}

	//--------------------------------------------------------------------------
	// try to get schema
	//--------------------------------------------------------------------------

	// determine schema type
	SchemaType st = (et == GETYPE_NODE) ? SCHEMA_NODE : SCHEMA_EDGE;

	Schema *s = GraphContext_GetSchema(gc, lbl, st);
	if(s == NULL) {
		res = false;
		goto cleanup;
	}

	//--------------------------------------------------------------------------
	// try to get attribute IDs
	//--------------------------------------------------------------------------

	for(uint8_t i = 0; i < n; i++) {
		const char *prop = props[i];

		// try to get property ID
		Attribute_ID id = GraphContext_GetAttributeID(gc, prop);

		if(id == ATTRIBUTE_ID_NONE) {
			// attribute missing
			res = false;
			goto cleanup;
		}

		attrs[i] = id;
	}

	//--------------------------------------------------------------------------
	// try to get constraint
	//--------------------------------------------------------------------------