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Add a reference column migration in Rails 4
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Rails 4.x
When you already have users and uploads tables and wish to add a new relationship between them.
All you need to do is: just generate a migration using the following command:
rails g migration AddUserToUploads user:references
Which will create a migr...
Python subprocess/Popen with a modified environment
I believe that running an external command with a slightly modified environment is a very common case. That's how I tend to do it:
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How to insert a value that contains an apostrophe (single quote)?
...r single quote, is a special character in SQL that specifies the beginning and end of string data. This means that to use it as part of your literal string data you need to escape the special character. With a single quote this is typically accomplished by doubling your quote. (Two single quote char...
How to prevent form from submitting multiple times from client side?
...e validation & MVC. The JS gets called first which always return false and then validation is called. So if my form has some validation error the form never gets submitted!!
– bjan
Jun 8 '12 at 12:09
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How can I add a custom HTTP header to ajax request with js or jQuery?
...e of is that with ajaxSetup you can only define one set of default headers and you can only define one beforeSend. If you call ajaxSetup multiple times, only the last set of headers will be sent and only the last before-send callback will execute.
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How to fix: “UnicodeDecodeError: 'ascii' codec can't decode byte”
...ing that does not contain any encoding. They only hold Unicode point codes and therefore can hold any Unicode point from across the entire spectrum. Strings contain encoded text, beit UTF-8, UTF-16, ISO-8895-1, GBK, Big5 etc. Strings are decoded to Unicode and Unicodes are encoded to strings. Files ...
Something like 'contains any' for Java set?
I have two sets, A and B, of the same type.
9 Answers
9
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How can I check if a jQuery plugin is loaded?
...er is not a jQuery plugin. It modifies/extends the javascript date object, and is not added as a jQuery namespace. You could check if the method you need exists, for example:
if(Date.today) {
//Use the dateJS today() method
}
But you might run into problems where the API overlaps the nati...
Git push error: Unable to unlink old (Permission denied)
...ll have the file opened this error will appear as well. Had the same error and that was why i was not able to push my changes in.
– Matias
Nov 3 '16 at 14:05
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How to run JUnit test cases from the command line
I would like to run JUnit test cases from the command line.
How can I do this?
11 Answers
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