<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Denis,<br></div><div><br data-mce-bogus="1"></div><div>Thank you for the follow-up. I did install the latest LTS (3.10.9) yesterday to see if things were any different. I confirmed today that the behavior is unchanged, and there's no reason why it should be any different based on your message.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>For me the simple workaround is to enable the Widget Type Option "Use a read-only line edit instead of a combobox." With this enabled, the "parent" field is populated as expected.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Thanks for your contributions to QGIS,<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Jeffrey<br data-mce-bogus="1"></div><div><br></div><div data-marker="__SIG_PRE__">--<br>Jeffrey Durrence<br>jeffrey.durrence@mcleanengineering.com<br>McLean Engineering Company<br>815 South Main Street<br>Moultrie, GA 31768<br>1.229.985.1148 (Voice)<br>1.229.985.2248 (FAX)<br>1.229.798.0480 (Mobile)<br></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Denis Rouzaud" <denis.rouzaud@gmail.com><br><b>To: </b>"Andreas Neumann" <a.neumann@carto.net><br><b>Cc: </b>"Jeffrey Durrence" <jeffrey.durrence@mcleanengineering.com>, "qgis-user" <qgis-user@lists.osgeo.org><br><b>Sent: </b>Tuesday, September 22, 2020 8:16:35 AM<br><b>Subject: </b>Re: [Qgis-user] Relation (1-N) Unpredictable Result (with default options)<br></div><div><br></div><div data-marker="__QUOTED_TEXT__"><div dir="ltr">Hi All,<br><div>Backporting doesn't seem easily possible and I am afraid of unseen side effects.</div><br><div>A simple fix would be to increase the fetching limit of the relation editor by doing:</div><br><div>QgsSettings().setValue("maxEntriesRelationWidget", 1000, QgsSettings.Gui )<br></div><br><div>(the default limit in 3.10 is 100)</div><br><div>Best wishes,</div><br><div>Denis</div><br></div><br><div class="elided-text"><div dir="ltr">Le mar. 15 sept. 2020 à 20:15, Andreas Neumann <<a href="mailto:a.neumann@carto.net" target="_blank" rel="nofollow noopener noreferrer">a.neumann@carto.net</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb( 204 , 204 , 204 );padding-left:1ex">
<div>
<p>Hi Jeffrey,<br>
</p>
<p>Ah - this sounds familiar. I am cc'ing Denis Rouzaud who fixed
this on master.<br>
</p>
<p>See <a href="https://github.com/qgis/QGIS/issues/37266" target="_blank" rel="nofollow noopener noreferrer">https://github.com/qgis/QGIS/issues/37266</a><br data-mce-bogus="1"></p>
<p>@Denis - was this ever backported to 3.10? From <a href="https://github.com/qgis/QGIS/pull/37286" target="_blank" rel="nofollow noopener noreferrer">https://github.com/qgis/QGIS/pull/37286</a>
I can't tell.</p>
<p>If this isn't fixed in 3.10 yet, I strongly suggest to do so.</p>
<p>Thanks for a clarification, Denis,</p>
<p>Andreas<br>
</p>
<div>Am 15.09.20 um 17:50 schrieb Jeffrey
Durrence:<br>
</div>
<blockquote>
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<div>
</div>
<div>Andreas,<br>
</div>
<div><br>
</div>
<div>Thank you for your interest in my reported problem. I have
worked with this some today in hopes of opening an issue on
GitHub. Unfortunately, the problem seems even more mysterious
to me after further testing. <br>
</div>
<div><br>
</div>
<div>I have 2 data data tables generated extracted from a
<a href="http://fulcrumapp.com" target="_blank" rel="nofollow noopener noreferrer">fulcrumapp.com</a> app. These 2 tables have a foreign key
relationship by design, so they should work well in QGIS using
the relation feature. After today's testing, I can tell you
that they actually do work fine so long as I use a very small
subset of the actual data. This is the mysterious part. For
example, if I limit the parent table to only 10 records and
then limit the child table to those records linked to the 10
parents, QGIS performs as expected. If I use all of the data
(around 4000 parent records and 9000 child records), then I
get an incorrect parent-to-child assignment for new child
records that I try to create.<br>
</div>
<div><br>
</div>
<div>With this being the case, I don't feel confident posting an
issue on GitHub. I would have to anonymize the data to post
on GitHub, and that would require further work on my end. If
I have more time today or tomorrow, I will try to further
investigate the problem to see if I can learn more about the
behavior.<br>
</div>
<div><br>
</div>
<div>-Jeffrey<br>
</div>
<div><br>
</div>
<div>--<br>
Jeffrey Durrence<br>
<a href="mailto:jeffrey.durrence@mcleanengineering.com" target="_blank" rel="nofollow noopener noreferrer">jeffrey.durrence@mcleanengineering.com</a><br>
McLean Engineering Company<br>
815 South Main Street<br>
Moultrie, GA 31768<br>
1.229.985.1148 (Voice)<br>
1.229.985.2248 (FAX)<br>
1.229.798.0480 (Mobile)<br>
</div>
<div><br>
</div>
<hr id="gmail-m_4277192089278253247zwchr">
<div><b>From: </b>"Andreas Neumann"
<a href="mailto:a.neumann@carto.net" target="_blank" rel="nofollow noopener noreferrer"><a.neumann@carto.net></a><br>
<b>To: </b>"Jeffrey Durrence"
<a href="mailto:jeffrey.durrence@mcleanengineering.com" target="_blank" rel="nofollow noopener noreferrer"><jeffrey.durrence@mcleanengineering.com></a><br>
<b>Cc: </b>"qgis-user" <a href="mailto:qgis-user@lists.osgeo.org" target="_blank" rel="nofollow noopener noreferrer"><qgis-user@lists.osgeo.org></a><br>
<b>Sent: </b>Tuesday, September 15, 2020 2:12:12 AM<br>
<b>Subject: </b>Re: [Qgis-user] Relation (1-N) Unpredictable
Result (with default options)<br>
</div>
<div><br>
</div>
<div>
<p>Hi Jeffrey,</p>
<p>Can you please open an issue on Github (<a href="https://github.com/qgis/QGIS/issues" rel="nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank">https://github.com/qgis/QGIS/issues</a>)
and include your DDL SQL statements you used for these tests
- including all pkey/fkey and other constraints you used and
a simple QGIS project file demonstrating the issue. It is
easier to discuss such issues on Github.</p>
<p>Maybe it is related to the fact that Comboboxes aren't
properly initialized with NULL values, for cases that don't
allow NULL values.</p>
<p>This is important to investigate - as it is unacceptable
that corrupt data is collected.</p>
<p>Thanks,</p>
<p>Andreas</p>
<p id="gmail-m_4277192089278253247reply-intro">On 2020-09-15 04:32, Jeffrey Durrence
wrote:</p>
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<div>
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<div>Today I was trying to set up an edit form for a
spatial table with a related, non-spatial table. I
have done this many times in the past, but it's been
a while. After using Project Properties to set up
my relation, I made several attempts to add a new
record in the "child" table. Each time I tried, the
new record did not get the correct value for the
field which relates the two tables. Existing
records were displayed as expected and could be
edited, but I could not add new features.</div>
<div> </div>
<div>I went to the docs to see if something had
changed that might be affecting me. I downloaded
sample shapefile data and used that to demonstrate
that related records could be created with that
data. I set up a clean database and QGIS project
file and made several attempts with my PostGIS
data. I did observe that some new options were
available to me under the widget area of the child
table. What had me confused was that with the
default options selected (the way I used to do it),
the "reference field" values generated for the "new"
child records were real values -- just not at all
the correct values.</div>
<div> </div>
<div>I tried several things with the PostGIS data, but
what finally fixed the behavior for me was to make
one change in the default Widget settings for the
"reference field" in the child table properties. In
my case, enabling the option to "Use a read-only
line edit instead of a combobox" resolved the
issue. When that is enabled, new child records get
the correct value for the reference field. I don't
completely understand what determined the inserted
values when this option was not enabled, but I
would think that enabling this by default would save
a lot of confusion for users like me. I was quite
surprised that I could not find folks talking about
this in the usual places. Could be that there is
something local to my environment, but I thought it
worth mentioning should someone else stumble upon
it.</div>
<div> </div>
<div>Using QGIS LTS (3.10.5) on Ubuntu 20.4 and
Windows 10 64-Bit with PostGIS backend (observed
same behavior with Postgres 10.14 / PostGIS 2.4.4
and Postgres 12.4 / PostGIS 3.0.0)</div>
<div> </div>
<div>--<br>
Jeffrey Durrence<br>
<a href="mailto:jeffrey.durrence@mcleanengineering.com" target="_blank" rel="nofollow noopener noreferrer">jeffrey.durrence@mcleanengineering.com</a><br>
McLean Engineering Company<br>
815 South Main Street<br>
Moultrie, GA 31768<br>
<br>
</div>
</div>
</div>
</div>
<br>
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