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Adding a column to an existing table in a Rails migration
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@neeraj you probably have the answer by now but for other seekers, yes you can as in e.g. t.string :column_x, limit: 10, after: :column_y (for Rails 4 at least)
– 244an
May 15 '19 at 19:59
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Building with Lombok's @Slf4j and Intellij: Cannot find symbol log
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Do you know if there is a workaround to get past this? Like possibly informing IntelliJ of the Lombok libraries without going through the plugin? I'm trying to use IntelliJ for debugging tests and this is making it difficult for me ...
How to check if an object is serializable in C#
...he DataContract attribute. Here is a snippet i use, if it stinks, let me know :)
public static bool IsSerializable(this object obj)
{
Type t = obj.GetType();
return Attribute.IsDefined(t, typeof(DataContractAttribute)) || t.IsSerializable || (obj is IXmlSerializable)
}
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In C#, what happens when you call an extension method on a null object?
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Actually, sometimes you don't know if someone is dead, so you still ask, and the person might reply, "no, just resting with my eyes closed"
– nurchi
Sep 17 '14 at 1:45
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Check OS version in Swift?
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Update:
Now you should use new availability checking introduced with Swift 2:
e.g. To check for iOS 9.0 or later at compile time use this:
if #available(iOS 9.0, *) {
// use UIStackView
} else {
// show sad face emoji
}
or...
Enable remote MySQL connection: ERROR 1045 (28000): Access denied for user
...mysql/mysql.conf.d/mysqld.cnf
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address = 127.0.0.1
(comment this line: bind-address = 127.0.0.1)
Then run service mysql restart.
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Python division
...2.7 and Python 3.3.
In Python 2.7 and Python 3.3:
>>>20//15
1
Now, see the comparison
>>>a = 7.0/4.0
>>>b = 7/4
>>>print a == b
For the above program, the output will be False in Python 2.7 and True in Python 3.3.
In Python 2.7 a = 1.75 and b = 1.
In Pyth...
Is there a way to automatically generate getters and setters in Eclipse?
...hold the desired keys (in my case, I use ALT + SHIFT + G)
Hit Apply and Ok
Now in your Java editor, select the field you want to create getter/setter methods for and press the shortcut you setup in Step 4. Hit ok in this window to create the methods.
Hope this helps!
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When to use MyISAM and InnoDB? [duplicate]
...resources. -- Mostly no longer true.
Full-text indexing. -- InnoDB has it now
Especially good for read-intensive (select) tables. -- Mostly no longer true.
Disk footprint is 2x-3x less than InnoDB's. -- As of Version 5.7, this is perhaps the only real advantage of MyISAM.
InnoDB:
The InnoDB st...
How does the “this” keyword work?
...meters of fun bound to the parameters specified arg1, arg2, arg3,....
By now the difference between apply, call and bind must have become apparent. apply allows to specify the arguments to function as array-like object i.e. an object with a numeric length property and corresponding non-negative in...