java - "No property exists found for type"... 将 QueryDslPredicateExecutor 与 MongoDB 和 Spring-Data 一起使用时

Question

我正在尝试将 QueryDslPredicateExecutor 与 MongoDB 和 Spring-Data 一起使用，但它似乎对“exists()”属性感到窒息。

我正在使用 -

org.springframework.boot:spring-boot-starter-parent:1.3.5.RELEASE  
com.querydsl:querydsl-mongodb:4.1.2  
com.querydsl:querydsl-apt:4.1.2  
org.mongodb.morphia:morphia:1.1.1  

堆栈跟踪

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property exists found for type Tree!
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:77) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:329) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:309) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:272) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:76) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:235) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:373) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:353) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:84) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mongodb.repository.query.PartTreeMongoQuery.<init>(PartTreeMongoQuery.java:60) ~[spring-data-mongodb-1.9.0.RELEASE.jar:na]
    at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory$MongoQueryLookupStrategy.resolveQuery(MongoRepositoryFactory.java:168) ~[spring-data-mongodb-1.9.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:435) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:220) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:266) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:252) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean.afterPropertiesSet(MongoRepositoryFactoryBean.java:108) ~[spring-data-mongodb-1.9.0.RELEASE.jar:na]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    ... 30 common frames omitted

这个类正在抛出异常

package org.springframework.data.mapping
// PropertyPath.class 
....

/**
 * Creates a leaf {@link PropertyPath} (no nested ones with the given name and owning type.
 * 
 * @param name must not be {@literal null} or empty.
 * @param owningType must not be {@literal null}.
 * @param base the {@link PropertyPath} previously found.
 */
PropertyPath(String name, TypeInformation<?> owningType, List<PropertyPath> base) {

    Assert.hasText(name, "Name must not be null or empty!");
    Assert.notNull(owningType, "Owning type must not be null!");
    Assert.notNull(base, "Perviously found properties must not be null!");

    String propertyName = name.matches(ALL_UPPERCASE) ? name : StringUtils.uncapitalize(name);
    TypeInformation<?> propertyType = owningType.getProperty(propertyName);

    if (propertyType == null) {
        throw new PropertyReferenceException(propertyName, owningType, base);
    }

    this.owningType = owningType;
    this.isCollection = propertyType.isCollectionLike();
    this.type = propertyType.getActualType();
    this.name = propertyName;
}

属性(方法)来 self 的存储库扩展的 QueryDslPredicateExecutor 类。

public abstract boolean org.springframework.data.querydsl.QueryDslPredicateExecutor.exists(com.querydsl.core.types.Predicate)  

这里是存储库-

public interface TreeRepository extends ExtendedMongoRepository<Tree, String>, QueryDslPredicateExecutor<Tree>{}

Answer 1

我最终通过扩展和实现 QueryDslPredicateExecutor 而不是更高级别的存储库来解决这个问题。

// Custom repository interface
@NoRepositoryBean
public interface ExtendedMongoRepository<T, ID extends Serializable> extends MongoRepository<T, ID>, QueryDslPredicateExecutor<T>{

  public Page<T> query(Query query, Pageable pageable);

}


// Custom Repository Implementation
public abstract class ExtendedMongoRepositoryImpl<T, ID extends Serializable> extends QueryDslMongoRepository<T, ID>
        implements ExtendedMongoRepository<T, ID> {

    private Class<T> clazz;
    private MongoOperations mongoOperations;
    @SuppressWarnings("unused")
    private MongoEntityInformation<T, ID> metadata;

    public ExtendedMongoRepositoryImpl(MongoEntityInformation<T, ID> metadata, MongoOperations mongoOperations) {
        super(metadata, mongoOperations);
        this.mongoOperations = mongoOperations;
        this.clazz = metadata.getJavaType();
        this.metadata = metadata;
    }

    @Override
    public Page<T> query(Query query, Pageable pageable) {
        List<T> list =  mongoOperations.find(query.with(pageable), clazz);
        return new PageImpl<T>(list, pageable, list.size());
    }
}  

// Entity Repository Interface
public interface TreeRepository extends ExtendedMongoRepository<Tree, String> {}