Question

目标是开发一个foxxservice，它仅在json中提供可用的用户集合。

我已经尝试过的方法：设置本地arangodb服务器。然后阅读文档并使用arangosh尝试命令。然后扩展foxxservice你好世界示例以获取相同的输出。

arangosh

127.0.0.1:8529@TestDatabase> db._collections()

[ 

  [ArangoCollection 2393976, "_appbundles" (type document, status loaded)], 

  [ArangoCollection 2393973, "_apps" (type document, status loaded)], 

  [ArangoCollection 2393961, "_aqlfunctions" (type document, status unloaded)], 

  [ArangoCollection 2394097, "_fishbowl" (type document, status loaded)],

  [ArangoCollection 2393964, "_frontend" (type document, status loaded)], 

  [ArangoCollection 2393943, "_graphs" (type document, status loaded)], 

  [ArangoCollection 2393970, "_jobs" (type document, status loaded)], 

  [ArangoCollection 2393948, "_modules" (type document, status loaded)],

  [ArangoCollection 2393967, "_queues" (type document, status loaded)], 

  [ArangoCollection 2393951, "_routing" (type document, status loaded)], 

  [ArangoCollection 2394131, "Relation" (type edge, status loaded)], 

  [ArangoCollection 2394114, "Table" (type document, status loaded)] 

]

foxx服务：

'use strict';

const createRouter = require('@arangodb/foxx/router');

const db = require('@arangodb').db;

const router = createRouter();

module.context.use(router);

router.get('/hello-world', function (req, res) {

  res.send('Hello World!');

  const collections = db._collections();

  res.json(collections);

})

.response(['application/json'], 'A generic greeting.')

.summary('Generic greeting')

.description('Prints a generic greeting.');

实际上，我期望使用相同的json。希望出于安全原因并非不可能。

但这是浏览器显示的内容：

[
{"_id":"2393976","_dbName":"TestDatabase"},

{"_id":"2393973","_dbName":"TestDatabase"},

{"_id":"2393961","_dbName":"TestDatabase"},

{"_id":"2394097","_dbName":"TestDatabase"},

{"_id":"2393964","_dbName":"TestDatabase"},

{"_id":"2393943","_dbName":"TestDatabase"},

{"_id":"2393970","_dbName":"TestDatabase"},

{"_id":"2393948","_dbName":"TestDatabase"},

{"_id":"2393967","_dbName":"TestDatabase"},

{"_id":"2393951","_dbName":"TestDatabase"},

{"_id":"2394131","_dbName":"TestDatabase"},

{"_id":"2394114","_dbName":"TestDatabase"}
]

Answer 1

可能的解决方案：

    private val postsDataFactory  = object: DataSource.Factory<String, Post>() {
        override fun create(): DataSource<String, Post> {
            return ItemDataSource(application)
        }
    }

    private val postsBoundaryCallback = object: PagedList.BoundaryCallback<Post>(){
        override fun onZeroItemsLoaded() {
            super.onZeroItemsLoaded()
            viewModelScope.launch {
                try {
                    val posts = postsRepo.findPosts(mutableMapOf("limit" to "1"))

                    database.postDao().create(posts)
                } catch (e: IOException) {
                    Log.d("NETWORK_ERROR", e.message)
                } catch (e: Exception) {
                    Log.d("UNCAUGHT_ERROR", e.message)
                }
            }
        }

        override fun onItemAtEndLoaded(itemAtEnd: Post) {
            viewModelScope.launch {
                try {
                    val posts = postsRepo.findPosts(mutableMapOf(
                        "before" to itemAtEnd.id,
                        "limit" to "1"
                    ))

                    database.postDao().create(posts)
                } catch (e: IOException) {
                    Log.d("NETWORK_ERROR", e.message)
                } catch (e: Exception) {
                    Log.d("UNCAUGHT_ERROR", e.message)
                }
            }
        }
    }

    private val postPageConfig = PagedList
        .Config
        .Builder()
        .setPageSize(10)
        .setInitialLoadSizeHint(10)
        .build()

    val postsLiveData = LivePagedListBuilder(
            postsDataFactory,
            postPageConfig
        )
        .setBoundaryCallback(postsBoundaryCallback)
        .build()

生成的输出：

'use strict';
const createRouter = require('@arangodb/foxx/router');
const db = require('@arangodb').db;
const router = createRouter();
module.context.use(router);
router.get('/hello-world', function (req, res) {
    res.send('Hello World!');
    var collections = [];
    db._collections().forEach(function(element) { 
        if(!element.name().startsWith("_")) {
            var obj = {};
            obj[element._id] = element.name();
            collections.push(obj);
        }
    });
    res.json(collections);
})
.response(['application/json'], 'A generic greeting.')
.summary('Generic greeting')
.description('Prints a generic greeting.');

有没有办法在foxxservice上获得与arangosh相同的输出？

1 个答案: