in plugin/src/main/groovy/grails/plugins/redis/ast/AbstractMemoizeASTTransformation.groovy [239:248]
static void addRedisServiceMemoizeKeyExpression(Map memoizeProperties, ArgumentListExpression argumentListExpression) {
if (memoizeProperties.get(KEY).toString().contains(HASH_CODE)) {
def ast = new AstBuilder().buildFromString("""
"${memoizeProperties.get(KEY).toString().replace(HASH_CODE, GSTRING).toString()}"
""")
argumentListExpression.addExpression(ast[0].statements[0].expression)
} else {
argumentListExpression.addExpression(new ConstantExpression(memoizeProperties.get(KEY).toString()))
}
}