crowdsource-backend/src/main/java/edu/nju/dao/AnswerDao.java

package edu.nju.dao;

import edu.nju.entities.Answer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public class AnswerDao {

    @Autowired
    private MongoOperations mongoOperations;

    public List<Answer> findAnswersByItemWorker(String item_id,String worker_id){
        Query query = new Query();
        query.addCriteria(Criteria.where("item_id").is(item_id).and("worker_id").is(worker_id));
        return mongoOperations.find(query, Answer.class);
    }

    //存在则更新，不存在则插入
    public String save(Answer answer){
        mongoOperations.save(answer);
        return answer.getId();
    }
}