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E11000 duplicate key error index in mongodb mongoose
Following is my user schema in user.js model -
25 Answers
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C++ Redefinition Header Files (winsock2.h)
How do I prevent from including header files twice? The problem is I'm including the in MyClass.h and then I'm including MyClass.h in many files, so it includes multiple times and redefinition error occurs. How to prevent?
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Cannot create an NSPersistentStoreCoordinator with a nil model
...xactly the same error message as the original post. I was wrestling with this for hours.
It was this line in my AppDelegate.m.
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"[same with name of xcdatamodeld]" withExtension:@"momd"];
For anyone out there searching this error message and ...
MySQL and GROUP_CONCAT() maximum length
... rows into a single string.
However, the maximum length of the result of this function is 1024 characters.
7 Answers
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Where can I find documentation on formatting a date in JavaScript?
I noticed that JavaScript's new Date() function is very smart in accepting dates in several formats.
35 Answers
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Save PL/pgSQL output from PostgreSQL to a CSV file
What is the easiest way to save PL/pgSQL output from a PostgreSQL database to a CSV file?
18 Answers
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What is the PostgreSQL equivalent for ISNULL()
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SELECT CASE WHEN field IS NULL THEN 'Empty' ELSE field END AS field_alias
Or more idiomatic:
SELECT coalesce(field, 'Empty') AS field_alias
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Salting Your Password: Best Practices?
I've always been curious... Which is better when salting a password for hashing: prefix, or postfix? Why? Or does it matter, so long as you salt?
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Reading specific lines only
...read a file, but I only want to read specific lines, say line #26 and #30. Is there any built-in feature to achieve this?
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Fat models and skinny controllers sounds like creating God models [closed]
...skinny controllers approach, esp. the Rails camp. As a result the routers is basically just figuring out what method to call on what controller and all the controller method does is call the corresponding method on the model and then bring up the view. So I've two concerns here which I don't unders...