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how to generate migration to make references polymorphic
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As far as I know, there's no built-in generator for polymorphic associations. Generate a blank migration and then modify it by hand according to your needs.
Update:
You'll need to specify which table you're changing. According to this S...
What is the difference between exit and return? [duplicate]
... _Exit from #include <stdlib.h>) terminates the process immediately.
Now there are also issues that are specific to C++.
C++ performs much more work than C when it is exiting from functions (return-ing). Specifically it calls destructors of local objects going out of scope. In most cases progr...
HTML Input=“file” Accept Attribute File Type (CSV)
...his attribute is very old and not accepted in modern browsers as far as I know, But here is an alternative to it, Try this
<script type="text/javascript" language="javascript">
function checkfile(sender) {
var validExts = new Array(".xlsx", ".xls", ".csv");
var fileExt = sender.value;...
How can I trigger a JavaScript event click
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UPDATE
This was an old answer. Nowadays you should just use click. For more advanced event firing, use dispatchEvent.
const body = document.body;
body.addEventListener('click', e => {
console.log('clicked body');
});
console.log('Using cl...
What's the concept of and differences between Framebuffer and Renderbuffer in OpenGL?
I'm confused about concept of Framebuffer and Renderbuffer. I know that they're required to render, but I want to understand them before use.
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php static function
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Now static calling of non-static methods works but is deprecated. Be careful using this syntax for instance methods!
– Jet
May 24 '09 at 12:52
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Most Pythonic way to provide global configuration variables in config.py? [closed]
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I know this is a few years old, but I'm a beginner and I think this config file is essentially what I am looking for (maybe too advanced), and I would like to understand it better. Do I just pass initialize ConfigHolder with a d...
View's SELECT contains a subquery in the FROM clause
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Now allowed in 5.7 ! :-)
– François Breton
Feb 18 '16 at 14:26
4
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How do I undo “Scope to this” in Visual Studio 2012?
...orer, I clicked on "Scope to this" to display only a part of the solution. Now I can't find how to get back to normal view.
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Remove Application Insight from application on Visual Studio 2013
...ion Insights Tools for Visual Studio" remove the application Insights and now when I create asp.net 4.6.1 MVC project it doesn't work. It show me error.
– Anirudha Gupta
Apr 6 '16 at 11:41
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