CMISLIB reports missing <content> tag in getContentStream call

[hughdbrown]

I am using cmislib to query Alfresco programmatically. I have a custom content type named bulletin in the namespace wg. I try to query it like this:

<python>
from cmislib import CmisClient

url = "http://myservert:8080/alfresco/cmisatom"
client = CmisClient(url, 'admin', 'admin')
repo = client.defaultRepository
results = repo.query("select * from wg:bulletin")
print results[0].getContentStream().read()
</python>

And I get this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/hbrown/.virtualenvs/access_manager_master/local/lib/python2.7/site-packages/cmislib/model.py", line 2467, in getContentStream
    assert(len(contentElements) == 1), 'Expected to find exactly one atom:content element.'
AssertionError: Expected to find exactly one atom:content element.
‍‍‍‍‍‍‍

When I modify cmislib's <a href="https://svn.apache.org/repos/asf/chemistry/cmislib/trunk/src/cmislib/atompub_binding.py">model.py</a> to dump its XMl, I get this:

<atom:entry>
    <atom:author>
        <atom:name/>
    </atom:author>
    <atom:id>http://chemistry.apache.org/aWQtMQ==</atom:id>
    <atom:published>2013-04-10T20:44:00Z</atom:published>
    <atom:title>Query Result id-1</atom:title>
    <app:edited>2013-04-10T20:44:00Z</app:edited>
    <atom:updated>2013-04-10T20:44:00Z</atom:updated>
    <cmisra:object xmlns:ns3="http://docs.oasis-open.org/ns/cmis/messaging/200908/">
        <cmis:properties>
            <cmis:propertyInteger displayName="Content Stream Length" localName="contentStreamLength" propertyDefinitionId="cmis:contentStreamLength" queryName="b.cmis:contentStreamLength">
                <cmis:value>249</cmis:value>
            </cmis:propertyInteger>
            <cmis:propertyId displayName="Object Type Id" localName="objectTypeId" propertyDefinitionId="cmis:objectTypeId" queryName="b.cmis:objectTypeId">
                <cmis:value>D:wg:bulletin</cmis:value>
            </cmis:propertyId>
            <cmis:propertyString displayName="Version Series Checked Out By" localName="versionSeriesCheckedOutBy" propertyDefinitionId="cmis:versionSeriesCheckedOutBy" queryName="b.cmis:versionSeriesCheckedOutBy"/>
            <cmis:propertyId displayName="Version Series Checked Out Id" localName="versionSeriesCheckedOutId" propertyDefinitionId="cmis:versionSeriesCheckedOutId" queryName="b.cmis:versionSeriesCheckedOutId"/>
            <cmis:propertyId displayName="Version series id" localName="versionSeriesId" propertyDefinitionId="cmis:versionSeriesId" queryName="b.cmis:versionSeriesId">
                <cmis:value>workspace://SpacesStore/1cd2053d-1fc4-4e85-b780-ba80284f0841</cmis:value>
            </cmis:propertyId>
            <cmis:propertyString displayName="wg:account" localName="account" propertyDefinitionId="wg:account" queryName="b.wg:account"/>
            <cmis:propertyString displayName="Version Label" localName="versionLabel" propertyDefinitionId="cmis:versionLabel" queryName="b.cmis:versionLabel">
                <cmis:value>1.0</cmis:value>
            </cmis:propertyString>
            <cmis:propertyBoolean displayName="Is Latest Version" localName="isLatestVersion" propertyDefinitionId="cmis:isLatestVersion" queryName="b.cmis:isLatestVersion">
                <cmis:value>true</cmis:value>
            </cmis:propertyBoolean>
            <cmis:propertyBoolean displayName="Is Version Series Checked Out" localName="isVersionSeriesCheckedOut" propertyDefinitionId="cmis:isVersionSeriesCheckedOut" queryName="b.cmis:isVersionSeriesCheckedOut">
                <cmis:value>false</cmis:value>
            </cmis:propertyBoolean>
            <cmis:propertyString displayName="Last Modified By" localName="lastModifiedBy" propertyDefinitionId="cmis:lastModifiedBy" queryName="b.cmis:lastModifiedBy">
                <cmis:value>admin</cmis:value>
            </cmis:propertyString>
            <cmis:propertyString displayName="Created by" localName="createdBy" propertyDefinitionId="cmis:createdBy" queryName="b.cmis:createdBy">
                <cmis:value>admin</cmis:value>
            </cmis:propertyString>
            <cmis:propertyDateTime displayName="wg:displayUntil" localName="displayUntil" propertyDefinitionId="wg:displayUntil" queryName="b.wg:displayUntil"/>
            <cmis:propertyId displayName="Alfresco Node Ref" localName="nodeRef" propertyDefinitionId="alfcmis:nodeRef" queryName="b.alfcmis:nodeRef">
                <cmis:value>workspace://SpacesStore/1cd2053d-1fc4-4e85-b780-ba80284f0841</cmis:value>
            </cmis:propertyId>
            <cmis:propertyString displayName="wg:email" localName="email" propertyDefinitionId="wg:email" queryName="b.wg:email"/>
            <cmis:propertyBoolean displayName="wg:isActive" localName="isActive" propertyDefinitionId="wg:isActive" queryName="b.wg:isActive">
                <cmis:value>false</cmis:value>
            </cmis:propertyBoolean>
            <cmis:propertyString displayName="wg:username" localName="username" propertyDefinitionId="wg:username" queryName="b.wg:username"/>
            <cmis:propertyBoolean displayName="Is Latest Major Version" localName="isLatestMajorVersion" propertyDefinitionId="cmis:isLatestMajorVersion" queryName="b.cmis:isLatestMajorVersion">
                <cmis:value>true</cmis:value>
            </cmis:propertyBoolean>
            <cmis:propertyId displayName="Content Stream Id" localName="contentStreamId" propertyDefinitionId="cmis:contentStreamId" queryName="b.cmis:contentStreamId">
                <cmis:value>store://2013/4/10/15/29/20b185d0-afae-4a7f-a06e-58eab399bdc9.bin</cmis:value>
            </cmis:propertyId>ATOM_NS
            <cmis:propertyString displayName="Name" localName="name" propertyDefinitionId="cmis:name" queryName="b.cmis:name">
                <cmis:value>.pythonrc</cmis:value>
            </cmis:propertyString>
            <cmis:propertyString displayName="Content Stream MIME Type" localName="contentStreamMimeType" propertyDefinitionId="cmis:contentStreamMimeType" queryName="b.cmis:contentStreamMimeType">
                <cmis:value>text/plain</cmis:value>
            </cmis:propertyString>
            <cmis:propertyDateTime displayName="Creation Date" localName="creationDate" propertyDefinitionId="cmis:creationDate" queryName="b.cmis:creationDate">
                <cmis:value>2013-04-10T15:29:18.146-04:00</cmis:value>
            </cmis:propertyDateTime>
            <cmis:propertyString displayName="Change token" localName="changeToken" propertyDefinitionId="cmis:changeToken" queryName="b.cmis:changeToken"/>
            <cmis:propertyString displayName="wg:state" localName="state" propertyDefinitionId="wg:state" queryName="b.wg:state"/>
            <cmis:propertyDateTime displayName="wg:displayFrom" localName="displayFrom" propertyDefinitionId="wg:displayFrom" queryName="b.wg:displayFrom"/>
            <cmis:propertyString displayName="Checkin Comment" localName="checkinComment" propertyDefinitionId="cmis:checkinComment" queryName="b.cmis:checkinComment"/>
            <cmis:propertyString displayName="wg:application" localName="application" propertyDefinitionId="wg:application" queryName="b.wg:application"/>
            <cmis:propertyId displayName="Object Id" localName="objectId" propertyDefinitionId="cmis:objectId" queryName="b.cmis:objectId">
                <cmis:value>workspace://SpacesStore/1cd2053d-1fc4-4e85-b780-ba80284f0841;1.0</cmis:value>
            </cmis:propertyId>
            <cmis:propertyBoolean displayName="Is Immutable" localName="isImmutable" propertyDefinitionId="cmis:isImmutable" queryName="b.cmis:isImmutable">
                <cmis:value>false</cmis:value>
            </cmis:propertyBoolean>
            <cmis:propertyBoolean displayName="Is Major Version" localName="isMajorVersion" propertyDefinitionId="cmis:isMajorVersion" queryName="b.cmis:isMajorVersion">
                <cmis:value>true</cmis:value>
            </cmis:propertyBoolean>
            <cmis:propertyString displayName="wg:institution" localName="institution" propertyDefinitionId="wg:institution" queryName="b.wg:institution"/>
            <cmis:propertyId displayName="Base Type Id" localName="baseTypeId" propertyDefinitionId="cmis:baseTypeId" queryName="b.cmis:baseTypeId">
                <cmis:value>cmis:document</cmis:value>
            </cmis:propertyId>
            <cmis:propertyString displayName="Content Stream Filename" localName="contentStreamFileName" propertyDefinitionId="cmis:contentStreamFileName" queryName="b.cmis:contentStreamFileName">
                <cmis:value>.pythonrc</cmis:value>
            </cmis:propertyString>
            <cmis:propertyDateTime displayName="Last Modified Date" localName="lastModificationDate" propertyDefinitionId="cmis:lastModificationDate" queryName="b.cmis:lastModificationDate">
                <cmis:value>2013-04-10T15:29:23.384-04:00</cmis:value>
            </cmis:propertyDateTime>
        </cmis:properties>
    </cmisra:object>
</atom:entry>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

How can my document be missing the content tag? Or is the problem in cmislib? I can see content in Alfresco share and explorer, so there must be an alternative way to get this data.

[jpotts]

As answered on stackoverflow.com, you must reload the object first. The reason is that in a query results list, content elements are not returned because, for plain text files, content elements contain the entire text, which could be quite large when added up over an entire result set. Binary files don't have this problem because the content element refers to the download URL of the binary file rather than including the content.

It is arguable that the getContentStream method should notice that the content element is missing and then force a reload on its own. But that's not how it works currently.

Hope this helps,

Jeff