如何在mongo spring boot中默认为所有查询添加默认条件 [英] How to add default criteria to all the queries by default in mongo spring boot

问题描述

我需要软删除给定 MongoDB 集合中的文档.为此，我使用了一个名为已删除的布尔值.所以现在当我从数据库中检索数据时，我必须总是提到在 deleted=false 的地方取数据.

I have a requirement to soft delete documents in a given MongoDB collection. For that, I use a boolean called deleted. So now when I am retrieving data from the database, I have to always mention taking the data where the deleted=false.

例如:

public Organization findOrgById(String id) {
    Query query = new Query();
    Criteria criteria = Criteria.where(Constants.ENTITY_ID).is(id)
            .and(Constants.DELETED).is(false);
    query.addCriteria(criteria);
    Organization res = mongoTemplate.findOne(query, Organization.class);
    return res;
}

有没有办法指定总是默认添加 deleted=false 的所有条件而不在代码本身中提及它?在 Hibernate 核心中有一个注释 @Where 但它不适用于 mongo 文档.

Is there a way to specify that always all the criteria to add deleted=false by default without mentioning it in the code itself? In Hibernate core there is an annotation @Where but it is not working with mongo documents.

推荐答案

我认为最好的方法是扩展 MongoTemplate 类，该类将添加您的 deleted=false 所有 Find 查询的条件.

I think the best way to do this is extend the MongoTemplate class that will add your deleted=false condition to all Find queries.

以下是如何使用一种用于执行 findOne 查询的方法的示例:

Here is an example of how to do it with one method used to execute findOne queries:

public class ExtendedMongoTemplate extends MongoTemplate {

    private static final Document DELETED_CRITERIA_DOC = Criteria.where(Constants.DELETED).is(false)
        .getCriteriaObject();

    @Override
    protected <T> T doFindOne(
            String collectionName,
            Document query,
            Document fields,
            CursorPreparer preparer,
            Class<T> entityClass) {
        query.putAll(DELETED_CRITERIA_DOC);
        return super.doFindOne(collectionName, query, fields, preparer, entityClass);
    }
    ...
}

该方法在方法doFindOne(Query query, Class entityClass)(最后一个委托执行

This method is called in the method doFindOne(Query query, Class<?> entityClass) (the last one delegates executing

其他要覆盖的方法是:

protected <S, T> List<T> doFind(String collectionName, Document query, Document fields,
    Class<S> entityClass, CursorPreparer preparer);

protected <T> T doFindAndRemove(String collectionName, Document query, Document fields,
    Document sort, @Nullable Collation collation, Class<T> entityClass);

protected <T> T doFindAndModify(String collectionName, Document query, Document fields, Document sort,
    Class<T> entityClass, UpdateDefinition update, @Nullable FindAndModifyOptions options);

protected <T> T doFindAndReplace(String collectionName, Document mappedQuery, Document mappedFields,
    Document mappedSort, com.mongodb.client.model.Collation collation, Class<?> entityType,
    Document replacement, FindAndReplaceOptions options, Class<T> resultType);

这些方法在低级别执行查询，因此它们接受带有查询条件的 BSON 文档，而不是 Spring 的条件.如果您这样做，Find-methods 将为您的所有查询添加一个额外的条件.

These methods execute queries at low-level, so they accept BSON-documents with the query criteria, not Spring's criteria. If you do this, the Find-methods will add an additional criteria to all you queries.

您也可以以类似的方式覆盖方法 findOne、find、findAndModify 等，但是这些方法有很多都使用 doFind* 方法.因此覆盖 doFind* 将导致与所有 Find-queries 一起工作.并且不要忘记也覆盖 findById(它也在内部使用 doFindOne).

You also can override methods findOne, find, findAndModify and so on in a similar manner, but there are a lot of these methods that all use doFind* methods. Thus overriding doFind* will lead to work with all Find-queries. And don't forget override also findById (it also uses doFindOne internally).

顺便说一下，@Where注解来自Hibernate，但Spring Data Mongo并没有使用它们.它需要自己的注释才能与您的实体一起使用.

By the way, @Where annotation is from Hibernate, but Spring Data Mongo doesn't use them. It requires its own annotations to work with your entities.

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