Spring Data MongoDB 中的独特之处 [英] Distinct in Spring Data MongoDB

问题描述

有没有人尝试使用 Spring Data for Mongo 将 distinct 合并到他们的查询中.如果您有示例，请发布.我应该在哪里以及如何包含 distinct flag?

Has anyone tried incorporating distinct in their query using Spring Data for Mongo. If you have an example can you please post it. Where and how should I include the distinct flag?

链接到Spring Data Mongo 示例 -- 示例 4.4.从方法名称创建查询

// Enables the distinct flag for the query
List<Person> findDistinctPeopleByLastnameOrFirstname(String lastname, String firstname);
List<Person> findPeopleDistinctByLastnameOrFirstname(String lastname, String firstname);

推荐答案

自从这个问题发布以来，很多事情都发生了变化.在这个问题不断出现时回答我自己的问题.

Lot has changed since this question was posted. Answering my own question as this question keeps popping up.

从 3.0 及更高版本开始提供支持

Support is there since 3.0 and higher

public DistinctIterable<String> getUniqueTask() {
    return mongoTemplate.getCollection(TABLE).distinct("FIELD", String.class);
}

旁注:您甚至可以在此查询中添加过滤器/正则表达式.阅读文档.如果找不到，ping，将发布答案.

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