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Removing a model in rails (reverse of “rails g model Title…”)
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bundle exec rake db:rollback
rails destroy model <model_name>
When you generate a model, it creates a database migration. If you run 'destroy' on that model, it will delete the migration file, but not the database table. So before run
bundle exec rake db:rollback
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Escape quotes in JavaScript
I'm outputting values from a database (it isn't really open to public entry, but it is open to entry by a user at the company -- meaning, I'm not worried about XSS ).
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Identifying and removing null characters in UNIX
I have a text file containing unwanted null characters (ASCII NUL, \0 ). When I try to view it in vi I see ^@ symbols, interleaved in normal text. How can I:
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nil detection in Go
... which is a valid comparison. To do that you can either use the golang new builtin, or initialize a pointer to it:
config := new(Config) // not nil
or
config := &Config{
host: "myhost.com",
port: 22,
} // not nil
or
var config *Config...
How do I do string replace in JavaScript to convert ‘9.61’ to ‘9:61’?
Given the code line
8 Answers
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Remove all whitespaces from NSString
I've been trying to get rid of the white spaces in an NSString , but none of the methods I've tried worked.
11 Answers
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Difference between \n and \r?
What’s the difference between \n (newline) and \r (carriage return)?
10 Answers
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How to import a module given its name as string?
I'm writing a Python application that takes as a command as an argument, for example:
11 Answers
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What's invokedynamic and how do I use it?
I keep hearing about all the new cool features that are being added to the JVM and one of those cool features is invokedynamic. I would like to know what it is and how does it make reflective programming in Java easier or better?
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Can Flask have optional URL parameters?
Is it possible to directly declare a flask URL optional parameter?
11 Answers
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