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How does Rails keep track of which migrations have run for a database?
...g row from schema_migrations.
For example, running a migration file named 20120620193144_create_users.rb will insert a new row with a version of 20120620193144 into the schema_migrations table.
You are free at any point to introduce migrations with earlier versions. Rails will always run any new m...
ASP.Net: Literal vs Label
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126
Yep, the main difference is that Literal controls just render out text, but Label controls surr...
Go Unpacking Array As Arguments
... sum = sum + v
}
return sum;
}
func main() {
arr := []int{2,4}
sum := my_func(arr...)
fmt.Println("Sum is ", sum)
}
Now you can sum as many things as you'd like. Notice the important ... after when you call the my_func function.
Running example: http://ideone.com/8htWfx
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Need command line to start web browser using adb
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200
Running this command will start a web browser in android:
adb shell am start -a android.inten...
how to change directory using Windows command line
I'm using cmd.exe (C:\WINDOWS\System32\cmd.exe) and I have to change my current directory to "D:\temp" i.e. temp folder in the D drive.
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Confusion: @NotNull vs. @Column(nullable = false) with JPA and Hibernate
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answered Sep 16 '11 at 2:28
Ryan StewartRyan Stewart
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Difference between `data` and `newtype` in Haskell
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242
Great question!
There are several key differences.
Representation
A newtype guarantees tha...
Force add despite the .gitignore file
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edited Oct 21 '15 at 15:04
answered Nov 4 '11 at 8:12
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returning a Void object
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BozhoBozho
539k129129 gold badges10061006 silver badges11101110 bronze badges
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Chrome Extension how to send data from content script to popup.html
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2 Answers
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