Question

我在React Native v0.46.2项目中使用本地PouchDB实例。我创建一个数据库，向其添加记录，执行Mango查询（搜索具有特定事件ID的文档），并且查询按预期工作。然后我修改一条记录，执行与以前相同的查询，结果不正确。它似乎只返回我刚修改的文档，但没有其他文档应该返回。如果我之后打印所有文档，它会显示所有文档，因为它们应包括新修改。

我关闭了索引，查询工作正常。但我确实需要索引才能快速搜索大量数据。

修改文档后，为什么我的查询无法正常工作？

我在下面创建了示例数据代码以演示此问题。我按此顺序执行以下操作：

创建索引
带有空白查询的索引数据库
将bulkdocs添加到db
执行查询
修改文档
再次执行查询。

`

testFunction() {

//Dummy data

let mockData = [{
'_id': '1',
'event_id': '136471',
},
{
'_id': '2',
'event_id': '136471',
},
{
'_id': '3',
'event_id': '136471',
},
{
'_id': '4',
'event_id': '136472',
}];

    //Create DB    
    this.testDB = new PouchDB('DBTest');

    let thisTestDB = this.testDB;

    this.testDB.createIndex({
        index: {
            fields: ['event_id'],
            ddoc: 'testTicketsDesignDoc',
        },
    })
    .then(
        (result) => {
            console.log('Indexing for Mango complete');

            //Index mango with initial blank query
            thisTestDB.find({
                selector: {},
                use_index: 'testTicketsDesignDoc',
                limit: 0,
            })
            .then(
                (result) => {
                    console.log('Indexing with blank Mango query complete');

                    //Add docs to database
                    thisTestDB.bulkDocs(mockData)
                    .then(
                        (result) => {
                            console.log('Bulkdocs successfully added to database.');

                            //Perform 1st query before modifying docs
                            thisTestDB.find({
                                selector: {
                                    'event_id': '136471',
                                },
                                use_index: 'testTicketsDesignDoc',
                            })
                            .then(
                                (searchResult) => {
                                    console.log('1st Mango query complete');
                                    console.log(searchResult);

                                    //Now modify a doc
                                    thisTestDB.get('1')
                                    .then(
                                        (doc) => {
                                            //Make any modifications to doc here

                                            thisTestDB.put(doc)
                                            .then (
                                                (putResult) => {
                                                    console.log(`Modifying doc successful: ${JSON.stringify(putResult)}`);

                                                    //Perform second query after modifying docs
                                                    thisTestDB.find({
                                                        selector: {
                                                            'event_id': '136471',
                                                        },
                                                        use_index: 'testTicketsDesignDoc',
                                                    })
                                                    .then(
                                                        (searchResult) => {
                                                            console.log('2nd Mango query complete');
                                                            console.log(searchResult);
                                                        }
                                                    );
                                                }
                                            )
                                            .catch(
                                                (error) => {
                                                    console.log(`Error modifying doc: ${error}`);
                                                }
                                            );
                                        }
                                    )
                                    .catch(
                                        (error) => {
                                            console.log(`Error modifying doc: ${error}`);
                                        }
                                    );
                                }
                            )
                            .catch(
                                (error) => {
                                    console.log(`Error performing first query: ${error.message}`);
                                }
                            );
                        }
                    )
                    .catch(
                        (error) => {
                            console.log(`Error adding bulk docs: ${error}`);
                        }
                    );
                }
            )
            .catch(
                (error) => {
                    console.log(`Error performing initial indexing query: ${error}`);
                }
            );
        }
    )
    .catch(
        (err) => {
            console.log(`Error - ${JSON.stringify(err)}`);
        }
    );
}

此外，我还尝试删除文档和压缩，然后将文档的新副本放入。而不是修改文档。我仍然遇到搜索索引的相同问题。

Answer 1

我尝试通过创建index.html文件和包含JavaScript代码的so.js文件（稍加修改）来重现您的问题条件，我发现第一和第二个查询都有效正如预期的那样没有任何问题，控制台日志如下所示。请注意，第二个查询返回一个带有_rev: "2-d36..."的文档，该文档是修改后的文档：

只需仔细检查，这是我的index.html文件：

<html>
    <head>
        <meta charset="utf-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
        <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
        <title>Pouch Debug</title>
    </head>
    <body>
        <script src="//cdn.jsdelivr.net/npm/pouchdb@6.4.3/dist/pouchdb.min.js"></script>
        <script src='//unpkg.com/pouchdb@6.4.3/dist/pouchdb.find.js'></script>
        <script src='./so.js'></script>
    </body>
</html>

我通过Python 3.5在我的index.html文件目录中运行我的HTTP服务器，如下所示：

$ python3.5 -m http.server
Serving HTTP on 0.0.0.0 port 8000 ...

这是我的so.js文件，在我的index.html文件中使用。我对您的代码做了很少的更改：

testFunction();

function testFunction() {

    //Dummy data

    let mockData = [{
'_id': '1',
'event_id': '136471',
    },
        {
'_id': '2',
'event_id': '136471',
        },
        {
'_id': '3',
'event_id': '136471',
        },
        {
'_id': '4',
'event_id': '136472',
        }];

    //Create DB    
    //this.testDB = new PouchDB('DBTest');

    let thisTestDB = new PouchDB('DBTest') /*this.testDB;*/

    thisTestDB.createIndex({
        index: {
            fields: ['event_id'],
            ddoc: 'testTicketsDesignDoc',
        },
    })
        .then(
            (result) => {
                console.log('Indexing for Mango complete');

                //Index mango with initial blank query
                thisTestDB.find({
                    selector: {},
                    use_index: 'testTicketsDesignDoc',
                    limit: 0,
                })
                    .then(
                        (result) => {
                            console.log('Indexing with blank Mango query complete');

                            //Add docs to database
                            thisTestDB.bulkDocs(mockData)
                                .then(
                                    (result) => {
                                        console.log('Bulkdocs successfully added to database.');

                                        //Perform 1st query before modifying docs
                                        thisTestDB.find({
                                            selector: {
                                                'event_id': '136471',
                                            },
                                            use_index: 'testTicketsDesignDoc',
                                        })
                                            .then(
                                                (searchResult) => {
                                                    console.log('1st Mango query complete');
                                                    console.log(searchResult);

                                                    //Now modify a doc
                                                    thisTestDB.get('1')
                                                        .then(
                                                            (doc) => {
                                                                //Make any modifications to doc here

                                                                thisTestDB.put(doc)
                                                                    .then (
                                                                        (putResult) => {
                                                                            console.log(`Modifying doc successful: ${JSON.stringify(putResult)}`);

                                                                            //Perform second query after modifying docs
                                                                            thisTestDB.find({
                                                                                selector: {
                                                                                    'event_id': '136471',
                                                                                },
                                                                                use_index: 'testTicketsDesignDoc',
                                                                            })
                                                                                .then(
                                                                                    (searchResult) => {
                                                                                        console.log('2nd Mango query complete');
                                                                                        console.log(searchResult);
                                                                                    }
                                                                                );
                                                                        }
                                                                    )
                                                                    .catch(
                                                                        (error) => {
                                                                            console.log(`Error modifying doc: ${error}`);
                                                                        }
                                                                    );
                                                            }
                                                        )
                                                        .catch(
                                                            (error) => {
                                                                console.log(`Error modifying doc: ${error}`);
                                                            }
                                                        );
                                                }
                                            )
                                            .catch(
                                                (error) => {
                                                    console.log(`Error performing first query: ${error.message}`);
                                                }
                                            );
                                    }
                                )
                                .catch(
                                    (error) => {
                                        console.log(`Error adding bulk docs: ${error}`);
                                    }
                                );
                        }
                    )
                    .catch(
                        (error) => {
                            console.log(`Error performing initial indexing query: ${error}`);
                        }
                    );
            }
        )
        .catch(
            (err) => {
                console.log(`Error - ${JSON.stringify(err)}`);
            }
        );
}

使用索引修改文档后，PouchDB find（）查询停止工作

1 个答案: