Question about duplicate data

Dagmar · September 19, 2014, 2:31pm

Hi

I recently found that you can view sent forms via the "Send Finalized
Forms" screen if you change the view to "View sent and unsent forms". This
screen allows you to select a form that has already been submitted and send
it again to the server. When it arrives on the server, it comes in exactly
the same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no duplicate data
is created?

Thanks
Dagmar

yanokwa · September 19, 2014, 3:02pm

Dagmar,

If the form has an instanceID, Aggregate de-dupes on that.

Yaw

···

-- Need ODK services? http://nafundi.com provides form design, server setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 7:31 AM, Dagmar diggitydugs@gmail.com wrote:

Hi

I recently found that you can view sent forms via the "Send Finalized Forms"
screen if you change the view to "View sent and unsent forms". This screen
allows you to select a form that has already been submitted and send it
again to the server. When it arrives on the server, it comes in exactly the
same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no duplicate data
is created?

Thanks
Dagmar

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Dagmar · September 19, 2014, 3:41pm

Hi

Thanks for the quick reply Yaw.

I am busy working on the ODK Collect - oXd bridge and looking into the
issue of duplicates. Can I assume that the instanceID is generated by
Aggregate and then passed back to ODK? I'll have another look at the ODK
collect code on Monday and then see where the instanceID is referenced.

Thanks again
Dagmar

···

On Fri, Sep 19, 2014 at 5:02 PM, Yaw Anokwa wrote:

Dagmar,

If the form has an instanceID, Aggregate de-dupes on that.

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 7:31 AM, Dagmar diggitydugs@gmail.com wrote:

Hi

I recently found that you can view sent forms via the "Send Finalized
Forms"
screen if you change the view to "View sent and unsent forms". This
screen
allows you to select a form that has already been submitted and send it
again to the server. When it arrives on the server, it comes in exactly
the
same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no duplicate
data
is created?

Thanks
Dagmar

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yanokwa · September 19, 2014, 4:03pm

Dagmar,

If the form requires an instanceID, then it's generated on the mobile
device and that ID is used in the server. If it doesn't require an
instanceID, then it is generated by ODK Aggregate when that submission
is posted. I don't think it goes back down to ODK Collect (or ODK
Briefcase), but I haven't looked at that code in a while...

Yaw

···

-- Need ODK services? http://nafundi.com provides form design, server setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 8:41 AM, Dagmar Timler diggitydugs@gmail.com wrote:

Hi

Thanks for the quick reply Yaw.

I am busy working on the ODK Collect - oXd bridge and looking into the issue
of duplicates. Can I assume that the instanceID is generated by Aggregate
and then passed back to ODK? I'll have another look at the ODK collect code
on Monday and then see where the instanceID is referenced.

Thanks again
Dagmar

On Fri, Sep 19, 2014 at 5:02 PM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form has an instanceID, Aggregate de-dupes on that.

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 7:31 AM, Dagmar diggitydugs@gmail.com wrote:

Hi

I recently found that you can view sent forms via the "Send Finalized
Forms"
screen if you change the view to "View sent and unsent forms". This
screen
allows you to select a form that has already been submitted and send it
again to the server. When it arrives on the server, it comes in exactly
the
same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no duplicate
data
is created?

Thanks
Dagmar

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Mitch_S · September 19, 2014, 4:51pm

NOTE:* the form definition is expected to define* a meta/instanceID field
-- See https://bitbucket.org/javarosa/javarosa/wiki/OpenRosaMetaDataSchema

The OpenRosa schema REQUIRES that a form specify this field. The best way
to define this, with the current tools, is

But for backward compatibility, the XLSForm generater omits the once()
wrapper ( the once() function was only recently added to JR ).

···

----------------- When the software submitting a filled-in form supplies the appropriate headers and requests an XML response, ODK Aggregate will return the "Server Response Format" described here: https://bitbucket.org/javarosa/javarosa/wiki/FormSubmissionAPI

And within that response XML, ODK Aggregate adds an <submissionMetadata...>
element. e.g.,

<OpenRosaResponse xmlns="http://openrosa.org/http/response">

    <message>Form Received! You've submitted 5 forms today</message>

   <submissionMetadata xmlns="http://www.opendatakit.org/xforms

http://www.opendatakit.org/xforms" ...>*

</OpenRosaResponse>

That <submissionMetadata...> element reports information back to the client
that is ignored by ODK Collect, but is processed by ODK Briefcase.

The net effect is, if your form does not conform to the OpenRosa
specification (and lacks a meta/instanceID field), then ODK Briefcase will
parse this element and remember the instanceID that ODK Aggregate assigned
to it. This enables ODK Briefcase and ODK Aggregate to coordinate their
actions and prevents the creation of duplicates during their interactions.
But, again, this is for support of legacy / non-conformant forms.

On Fri, Sep 19, 2014 at 9:03 AM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form requires an instanceID, then it's generated on the mobile
device and that ID is used in the server. If it doesn't require an
instanceID, then it is generated by ODK Aggregate when that submission
is posted. I don't think it goes back down to ODK Collect (or ODK
Briefcase), but I haven't looked at that code in a while...

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 8:41 AM, Dagmar Timler diggitydugs@gmail.com wrote:

Hi

Thanks for the quick reply Yaw.

I am busy working on the ODK Collect - oXd bridge and looking into the
issue
of duplicates. Can I assume that the instanceID is generated by Aggregate
and then passed back to ODK? I'll have another look at the ODK collect
code
on Monday and then see where the instanceID is referenced.

Thanks again
Dagmar

On Fri, Sep 19, 2014 at 5:02 PM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form has an instanceID, Aggregate de-dupes on that.

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 7:31 AM, Dagmar diggitydugs@gmail.com wrote:

Hi

I recently found that you can view sent forms via the "Send Finalized
Forms"
screen if you change the view to "View sent and unsent forms". This
screen
allows you to select a form that has already been submitted and send
it
again to the server. When it arrives on the server, it comes in
exactly
the
same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no duplicate
data
is created?

Thanks
Dagmar

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Mitch Sundt
Software Engineer
University of Washington
mitchellsundt@gmail.com

Dagmar · September 19, 2014, 7:16pm

Thank you Mitch, this is very helpful.

···

On Fri, Sep 19, 2014 at 6:51 PM, Mitch Sundt wrote:

NOTE:* the form definition is expected to define* a meta/instanceID field
-- See https://bitbucket.org/javarosa/javarosa/wiki/OpenRosaMetaDataSchema

The OpenRosa schema REQUIRES that a form specify this field. The best way
to define this, with the current tools, is

<bind nodeset="/data/meta/instanceID"
calculate="once(concat("uuid:",uuid()))" readonly="true()" type="string"/>

But for backward compatibility, the XLSForm generater omits the once()
wrapper ( the once() function was only recently added to JR ).

When the software submitting a filled-in form supplies the appropriate
headers and requests an XML response, ODK Aggregate will return the "Server
Response Format" described here:
https://bitbucket.org/javarosa/javarosa/wiki/FormSubmissionAPI

And within that response XML, ODK Aggregate adds an
<submissionMetadata...> element. e.g.,
<OpenRosaResponse xmlns="http://openrosa.org/http/response">

    <message>Form Received! You've submitted 5 forms today</message>
   <submissionMetadata xmlns="http://www.opendatakit.org/xforms <http://www.opendatakit.org/xforms>" ...>*
That <submissionMetadata...> element reports information back to the
client that is ignored by ODK Collect, but is processed by ODK Briefcase.

The net effect is, if your form does not conform to the OpenRosa
specification (and lacks a meta/instanceID field), then ODK Briefcase will
parse this element and remember the instanceID that ODK Aggregate assigned
to it. This enables ODK Briefcase and ODK Aggregate to coordinate their
actions and prevents the creation of duplicates during their interactions.
But, again, this is for support of legacy / non-conformant forms.

On Fri, Sep 19, 2014 at 9:03 AM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form requires an instanceID, then it's generated on the mobile
device and that ID is used in the server. If it doesn't require an
instanceID, then it is generated by ODK Aggregate when that submission
is posted. I don't think it goes back down to ODK Collect (or ODK
Briefcase), but I haven't looked at that code in a while...

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 8:41 AM, Dagmar Timler diggitydugs@gmail.com wrote:

Hi

Thanks for the quick reply Yaw.

I am busy working on the ODK Collect - oXd bridge and looking into the
issue
of duplicates. Can I assume that the instanceID is generated by
Aggregate
and then passed back to ODK? I'll have another look at the ODK collect
code
on Monday and then see where the instanceID is referenced.

Thanks again
Dagmar

On Fri, Sep 19, 2014 at 5:02 PM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form has an instanceID, Aggregate de-dupes on that.

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 7:31 AM, Dagmar diggitydugs@gmail.com wrote:

Hi

I recently found that you can view sent forms via the "Send Finalized
Forms"
screen if you change the view to "View sent and unsent forms". This
screen
allows you to select a form that has already been submitted and send
it
again to the server. When it arrives on the server, it comes in
exactly
the
same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no
duplicate
data
is created?

Thanks
Dagmar

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Software Engineer
University of Washington
mitchellsundt@gmail.com

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Dagmar · September 30, 2014, 6:37pm

Hi Mitch

I wonder if you could take a look at the attached Sample Form and let me
know if we got the instanceID element right? Chantell followed the guide
here: http://opendatakit.org/help/form-design/

What we are seeing on the client now is no instanceID returned in the data
XML. I don't know if it's due to an error in the form, or some extra work
we need to do on the oXd bridge.

Any input would be valuable.

Thanks
Dagmar

oxd-sample-form.xml (10.2 KB)

···

On Fri, Sep 19, 2014 at 6:51 PM, Mitch Sundt wrote:

NOTE:* the form definition is expected to define* a meta/instanceID field
-- See https://bitbucket.org/javarosa/javarosa/wiki/OpenRosaMetaDataSchema

The OpenRosa schema REQUIRES that a form specify this field. The best way
to define this, with the current tools, is

<bind nodeset="/data/meta/instanceID"
calculate="once(concat("uuid:",uuid()))" readonly="true()" type="string"/>

But for backward compatibility, the XLSForm generater omits the once()
wrapper ( the once() function was only recently added to JR ).

When the software submitting a filled-in form supplies the appropriate
headers and requests an XML response, ODK Aggregate will return the "Server
Response Format" described here:
https://bitbucket.org/javarosa/javarosa/wiki/FormSubmissionAPI

And within that response XML, ODK Aggregate adds an
<submissionMetadata...> element. e.g.,
<OpenRosaResponse xmlns="http://openrosa.org/http/response">

    <message>Form Received! You've submitted 5 forms today</message>
   <submissionMetadata xmlns="http://www.opendatakit.org/xforms <http://www.opendatakit.org/xforms>" ...>*
That <submissionMetadata...> element reports information back to the
client that is ignored by ODK Collect, but is processed by ODK Briefcase.

The net effect is, if your form does not conform to the OpenRosa
specification (and lacks a meta/instanceID field), then ODK Briefcase will
parse this element and remember the instanceID that ODK Aggregate assigned
to it. This enables ODK Briefcase and ODK Aggregate to coordinate their
actions and prevents the creation of duplicates during their interactions.
But, again, this is for support of legacy / non-conformant forms.

On Fri, Sep 19, 2014 at 9:03 AM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form requires an instanceID, then it's generated on the mobile
device and that ID is used in the server. If it doesn't require an
instanceID, then it is generated by ODK Aggregate when that submission
is posted. I don't think it goes back down to ODK Collect (or ODK
Briefcase), but I haven't looked at that code in a while...

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 8:41 AM, Dagmar Timler diggitydugs@gmail.com wrote:

Hi

Thanks for the quick reply Yaw.

I am busy working on the ODK Collect - oXd bridge and looking into the
issue
of duplicates. Can I assume that the instanceID is generated by
Aggregate
and then passed back to ODK? I'll have another look at the ODK collect
code
on Monday and then see where the instanceID is referenced.

Thanks again
Dagmar

On Fri, Sep 19, 2014 at 5:02 PM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form has an instanceID, Aggregate de-dupes on that.

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 7:31 AM, Dagmar diggitydugs@gmail.com wrote:

Hi

I recently found that you can view sent forms via the "Send Finalized
Forms"
screen if you change the view to "View sent and unsent forms". This
screen
allows you to select a form that has already been submitted and send
it
again to the server. When it arrives on the server, it comes in
exactly
the
same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no
duplicate
data
is created?

Thanks
Dagmar

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Software Engineer
University of Washington
mitchellsundt@gmail.com

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yanokwa · October 1, 2014, 12:40am

Dagmar,

There is nothing obviously wrong with your form. Test with this basic
form and make sure your devices are reporting an instanceId. If you
save the form and open it on the SD card, you should see something
like this..

<?xml version='1.0' ?><test

id="test">2014-09-30T17:32:50.825-072014-09-30T17:32:54.362-07355136055453222Hiuuid:96735772-93b2-4650-b4e9-7b37bacc39c7

My guess is that either you are using an old version of Collect or
your bridge has a bug.

Yaw

test.xml (1.11 KB)

···

-- Need ODK services? http://nafundi.com provides form design, server setup, professional support, and software development for ODK.

On Tue, Sep 30, 2014 at 11:37 AM, Dagmar Timler diggitydugs@gmail.com wrote:

Hi Mitch

I wonder if you could take a look at the attached Sample Form and let me
know if we got the instanceID element right? Chantell followed the guide
here: http://opendatakit.org/help/form-design/

What we are seeing on the client now is no instanceID returned in the data
XML. I don't know if it's due to an error in the form, or some extra work we
need to do on the oXd bridge.

Any input would be valuable.

Thanks
Dagmar

On Fri, Sep 19, 2014 at 6:51 PM, Mitch Sundt mitchellsundt@gmail.com wrote:
NOTE: the form definition is expected to define a meta/instanceID field --
See https://bitbucket.org/javarosa/javarosa/wiki/OpenRosaMetaDataSchema

The OpenRosa schema REQUIRES that a form specify this field. The best way
to define this, with the current tools, is

<bind nodeset="/data/meta/instanceID"
calculate="once(concat("uuid:",uuid()))" readonly="true()" type="string"/>

But for backward compatibility, the XLSForm generater omits the once()
wrapper ( the once() function was only recently added to JR ).

When the software submitting a filled-in form supplies the appropriate
headers and requests an XML response, ODK Aggregate will return the "Server
Response Format" described here:
https://bitbucket.org/javarosa/javarosa/wiki/FormSubmissionAPI

And within that response XML, ODK Aggregate adds an
<submissionMetadata...> element. e.g.,
<OpenRosaResponse xmlns="http://openrosa.org/http/response">

    <message>Form Received! You've submitted 5 forms today</message>

    <submissionMetadata xmlns="http://www.opendatakit.org/xforms" ...>

</OpenRosaResponse>
That <submissionMetadata...> element reports information back to the
client that is ignored by ODK Collect, but is processed by ODK Briefcase.

The net effect is, if your form does not conform to the OpenRosa
specification (and lacks a meta/instanceID field), then ODK Briefcase will
parse this element and remember the instanceID that ODK Aggregate assigned
to it. This enables ODK Briefcase and ODK Aggregate to coordinate their
actions and prevents the creation of duplicates during their interactions.
But, again, this is for support of legacy / non-conformant forms.

On Fri, Sep 19, 2014 at 9:03 AM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form requires an instanceID, then it's generated on the mobile
device and that ID is used in the server. If it doesn't require an
instanceID, then it is generated by ODK Aggregate when that submission
is posted. I don't think it goes back down to ODK Collect (or ODK
Briefcase), but I haven't looked at that code in a while...

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 8:41 AM, Dagmar Timler diggitydugs@gmail.com wrote:

Hi

Thanks for the quick reply Yaw.

I am busy working on the ODK Collect - oXd bridge and looking into the
issue
of duplicates. Can I assume that the instanceID is generated by
Aggregate
and then passed back to ODK? I'll have another look at the ODK collect
code
on Monday and then see where the instanceID is referenced.

Thanks again
Dagmar

On Fri, Sep 19, 2014 at 5:02 PM, Yaw Anokwa yanokwa@nafundi.com wrote:

Dagmar,

If the form has an instanceID, Aggregate de-dupes on that.

Yaw

Need ODK services? http://nafundi.com provides form design, server
setup, professional support, and software development for ODK.

On Fri, Sep 19, 2014 at 7:31 AM, Dagmar diggitydugs@gmail.com wrote:

Hi

I recently found that you can view sent forms via the "Send
Finalized
Forms"
screen if you change the view to "View sent and unsent forms". This
screen
allows you to select a form that has already been submitted and send
it
again to the server. When it arrives on the server, it comes in
exactly
the
same format as the original submit (as far as I can see).

My question is: how does the Aggregate server ensure that no
duplicate
data
is created?

Thanks
Dagmar

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Mitch Sundt
Software Engineer
University of Washington
mitchellsundt@gmail.com

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