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The cast to value type 'Int32' failed because the materialized value is null
...from u in context.User
join ch in context.CreditHistory on u.ID equals ch.UserID
where u.ID == userID
select (int?)ch.Amount).Sum() ?? 0;
This first casts to int? to tell the C# compiler that this expression can inde...
git: fatal: Could not read from remote repository
... @user61629: I know I'm late to the party, but you should consider using private/public key pairs instead of passwords.
– code_dredd
Apr 22 '16 at 22:06
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Hide all but $(this) via :not in jQuery selector
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$(this).siblings().hide();
Traversing/Siblings
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Prevent users from submitting a form by hitting Enter
...preferred over keyup as the keyup is too late to block form submit. Historically there was also the keypress, but this is deprecated, as is the KeyboardEvent.keyCode. You should use KeyboardEvent.key instead which returns the name of the key being pressed. When Enter is checked, then this would chec...
Installing PDO driver on MySQL Linux server
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Basically the answer from Jani Hartikainen is right! I upvoted his answer.
What was missing on my system (based on Ubuntu 15.04) was to enable PDO Extension in my php.ini
extension=pdo.so
extension=pdo_mysql.so
restart the web...
How to kill a process running on particular port in Linux?
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This fuser 8080/tcp will print you PID of process bound on that port.
And this fuser -k 8080/tcp will kill that process.
Works on Linux only. More universal is use of lsof -i4 (or 6 for IPv6).
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JComboBox Selection Change Listener?
... in order to complement, ActionListener is also fired if addItem method is called.
– Gabriel Câmara
Feb 23 '15 at 16:01
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HTTP header line break style
...arker for all protocol elements except the entity-body
RFC2616 was technically obsoleted by RFC7230, but it makes no drastic changes and again calls out CRLF as the delimiter in section 3, and that RFC references RFC5234, Appendix B.1 to define "CRLF" as %x0D %x0A.
However, recognizing that peopl...
Get first day of week in SQL Server
...re saying, how many weeks have passed since Monday, January 1, 1900? Let's call that [n]. Ok, now add [n] weeks to Monday, January 1, 1900. You should not be surprised that this ends up being a Monday. DATEADD has no idea that you want to add weeks but only until you get to a Sunday, it's just addin...
Ruby on Rails. How do I use the Active Record .build method in a :belongs to relationship?
...ve it saved instantly (much like the corresponding "create" method you can call on the collection)
How is rails smart enough? It's magic (or more accurately, I just don't know, would love to find out!)
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