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Rails auto-assigning id that already exists
...ll primary key); insert into t values (1); insert into t values (default); ERROR: duplicate key value violates unique constraint "t_pkey" DETAIL: Key (id)=(1) already exists.
– Dondi Michael Stroma
Oct 27 '14 at 2:57
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How can I rename a project folder from within Visual Studio?
...n VS2019. Gives warnings about project references not existing and compile errors about missing the namespaces and classes in the referenced project.
– Jeff Walker Code Ranger
May 12 at 17:57
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Algorithm to detect corners of paper sheet in photo
...m working on the similar project. I run above the code and it gives me the error " No module named cv ". I installed the Open CV 2.4 version and import cv2 is working perfectly for me.
– Navneet Singh
Dec 19 '13 at 17:59
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.NET 4.0 build issues on CI server
...ET 4.0 build server reference assemblies warnings MSB3644
If you get this error: "Microsoft.WebApplication.targets was not found" - just copy the target from dev machine https://stackoverflow.com/a/5344246/423356
if mvc3 is not installed in build server; "add deployable assemblies" to the mvc proj...
How do I break out of a loop in Perl?
...loop, but since I'm also using strict subs in my Perl code, I'm getting an error saying:
5 Answers
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Why is Java's Iterator not an Iterable?
...oduction of the enhanced for loop was that it "eliminates the drudgery and error-proneness of iterators and index variables when iterating over collections and arrays" [1].
Collection<Item> items...
for (Iterator<Item> iter = items.iterator(); iter.hasNext(); ) {
Item item = iter.n...
Should I learn C before learning C++? [closed]
...standing of C++? Usually, C programmers who learn C++ end up writing ugly, error-prone "C with classes" style code. I'm not saying this always happens, but it is the most natural progression when starting with C, because C is much closer to that horrible style of C++ than it is to "modern" C++.
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Is there a way to word-wrap long words in a div?
...ine from his code --> white-space: -pre-wrap; beacause it was giving an error, so the final working code is the following:
.wordwrap {
white-space: pre-wrap; /* CSS3 */
white-space: -moz-pre-wrap; /* Firefox */
white-space: -o-pre-wrap; /* Opera 7 */
word-wrap: brea...
How do I create a unique constraint that also allows nulls?
... trying to do exactly this in SQL Server 2008 Express edition and I get an error as follows: CREATE UNIQUE NONCLUSTERED INDEX UC_MailingId ON [SLS-CP].dbo.MasterFileEntry(MailingId) WHERE MailingId IS NOT NULL Results in: Msg 156, Level 15, State 1, Line 3 Incorrect syntax near the keyword 'WHE...
How to duplicate a git repository? (without forking)
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I tried your approach. And I got this error message: ! [remote rejected] master -> master (pre-receive hook declined) and several other similar messages. The last one was : error: failed to push some refs How can I correct that?
– LN...