我正在构建一个包含45000多个目录的展厅，每个目录在CoreData中表示为Literature。
要优化搜索 - 我没有在LiteratureSearchIndex上搜索，而是在CoreData中添加了另一个实体 - searchvalue，其中包含score（标题字/关键字/标记等） 。这代表了文献的一部分），literatureid（对结果进行加权）和 let request = NSFetchRequest<NSFetchRequestResult>(entityName: "LiteratureSearchIndex")
let entityDescription = NSEntityDescription.entity(forEntityName: "LiteratureSearchIndex", in: moc)
let sumDescription = NSExpressionDescription()
sumDescription.name = "totalScore"
sumDescription.expression = NSExpression(forFunction: "sum:", arguments: [NSExpression(forKeyPath: "score")])
sumDescription.expressionResultType = .integer64AttributeType
if let literatureid = entityDescription?.attributesByName["literatureid"] {
request.propertiesToGroupBy = [literatureid]
request.propertiesToFetch = [literatureid, sumDescription]
request.havingPredicate = NSPredicate(format: "%@ >= %@", NSExpression(forVariable: "totalScore"), NSNumber(value: minScore))
}
request.predicate = ...
request.resultType = .dictionaryResultType
request.fetchBatchSize = 50
。
当用户在搜索或过滤器中输入内容时 - 我会在LiteratureSearchIndex上执行fetchRequest，对结果进行分组并对总分进行排序。
results.sort(by: { (a: [String: Any], b: [String: Any]) -> Bool in
if let aTotalScore = a["totalScore"] as? Int, let bTotalScore = b["totalScore"] as? Int {
return aTotalScore > bTotalScore
} else {
return true
}
})
我目前正在对moc.fetch（）之后的结果进行排序：
havingPredicate是否有更好/更快的方式对结果进行排序（类似于在字典数组上应用<!DOCTYPE html>
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）？