【已解决】PyMongo的GridFS中使用fs的collection去put出错：TypeError Collection object is not callable

折腾：

期间，用代码：

<code>
mongoClient = MongoClient()
logging.info("mongoClient=%s", mongoClient)
gridfsDb = mongoClient.gridfs
logging.info("gridfsDb=%s", gridfsDb)

collectionNames = gridfsDb.collection_names(include_system_collections=False)
logging.info("collectionNames=%s", collectionNames)

# fsCollection = gridfsDb.fs
fsCollection = gridfsDb["fs"]
logging.info("fsCollection=%s", fsCollection)

someFile = fsCollection.files.find_one()
logging.info("someFile=%s", someFile)

# test read existed file info
ottoTheCatFile = fsCollection.files.find_one({"filename": "Otto the Cat-withMIME.MP3"})
logging.info("ottoTheCatFile=%s", ottoTheCatFile)

# test put local file
curAudioFilename = "英语资源\All Aboard Reading\音频\Lots of Hearts.mp3"
curAudioFilenameFiltered = re.sub(r"\\", "/", curAudioFilename) #'英语资源/All Aboard Reading/音频/Lots of Hearts.mp3'
# curAudioFullFilename = "/Users/crifan/dev/dev_root/company/naturling/数据/FromMaggie/" + curAudioFilename
pathPrefix = "/Users/crifan/dev/dev_root/company/naturling/数据/FromMaggie/"
curAudioFullFilename = os.path.join(pathPrefix, curAudioFilenameFiltered)

if os.path.isfile(curAudioFullFilename):
    with open(curAudioFullFilename) as audioFp :
        audioFileId = fsCollection.put(audioFp,
                         filename="Lots of Hearts_withMIME.mp3",
                         content_type="application/mpeg")
        logging.info("audioFileId=%s", audioFileId)
else:
    logging.error("Can not find file: %s", curAudioFullFilename)
</code>

运行出错：

<code>Traceback (most recent call last):
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1668, in &lt;module&gt;
    main()
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1662, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1072, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/Users/crifan/dev/dev_root/company/naturling/projects/mongodb/saveLocalData/pymongoTest.py", line 66, in &lt;module&gt;
    content_type="application/mpeg")
  File "/usr/local/lib/python2.7/site-packages/pymongo/collection.py", line 3104, in __call__
    self.__name.split(".")[-1])
TypeError: 'Collection' object is not callable. If you meant to call the 'put' method on a 'Collection' object it is failing because no such method exists.
</code>

难道是with 内部，无法识别外部的变量fsCollection？

或者是此处fsCollection用法不正确，没有put？

pymongo TypeError: ‘Collection’ object is not callable

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TypeError: ‘Collection’ object is not callable. · Issue #211 · mzupan/nagios-plugin-mongodb

看起来貌似没问题啊

此处fs的collection，PyCharm中无法动态识别源码：

看起来此处的：

fsCollection是：Collection(Database(MongoClient(host=[‘localhost:27017′], document_class=dict, tz_aware=False, connect=True), u’gridfs’), u’fs’)

然后换用之前别处代码的写法：

<code># fsCollection = gridfsDb["fs"]
fsCollection = GridFS(gridfsDb)
</code>

看看是否有变化：

果然看起来就像对的：

<gridfs.GridFS object at 0x10563cc90>

看起来这个才是PyMongo支持的对象

然后接着再去操作试试

此时，之前的代码：

<code>fsCollection.files.find_one()
</code>

就会报错了：

<code>Traceback (most recent call last):
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1668, in &lt;module&gt;
    main()
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1662, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1072, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/Users/crifan/dev/dev_root/company/naturling/projects/mongodb/saveLocalData/pymongoTest.py", line 47, in &lt;module&gt;
    someFile = fsCollection.files.find_one()
AttributeError: 'GridFS' object has no attribute 'files'
</code>

去改为：

<code># someFile = fsCollection.files.find_one()
someFile = fsCollection.find_one()
</code>

结果就可以了：

然后接着代码就正常了，可以put去保存文件了：

【总结】

此处之所以报错：

<code>TypeError: 'Collection' object is not callable. If you meant to call the 'put' method on a 'Collection' object it is failing because no such method exists.
</code>

是因为：

此处写的代码，是按照自己之前在MongoDB的命令行中操作的逻辑去用：

<code>fsCollection = gridfsDb.fs
</code>

或

<code>fsCollection = gridfsDb["fs”]
</code>

得到的是Collection类型变量，之后去：

<code>someFile = fsCollection.files.find_one()
</code>

也都没问题。

但是对于：

<code>fsCollection.put
</code>

就报错了。因为本身没有put。

而此处已经用的是MongoDB的Python的driver：PyMongo，其标准写法是：

<code>fsCollection = GridFS(gridfsDb)
</code>

以及：

<code>someFile = fsCollection.find_one()
</code>

然后才有：

<code>if os.path.isfile(curAudioFullFilename):
    with open(curAudioFullFilename) as audioFp :
        audioFileId = fsCollection.put(audioFp,
                         filename="Lots of Hearts_withMIME.mp3",
                         content_type="application/mpeg")
</code>

才能正常打开本地的文件，去put保存。

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