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How do you write a migration to rename an ActiveRecord model and its table in Rails?
... @mathee: yes, you have to change that manually, or using an IDE that can do Ruby refactoring and commit it to your version control system.
– pupeno
Apr 30 '10 at 9:00
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HTML Input=“file” Accept Attribute File Type (CSV)
...is helps someone in the future. Thanks everyone for your help.
<input id="fileSelect" type="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" />
Valid Accept Types:
For CSV files (.csv), use:
<input type="file" accept="...
wildcard * in CSS for classes
...ve these divs that I'm styling with .tocolor , but I also need the unique identifier 1,2,3,4 etc. so I'm adding that it as another class tocolor-1 .
...
Does a UNIQUE constraint automatically create an INDEX on the field(s)?
...e keys are in fact B-tree type indexes.
A composite index on (email, user_id) is enough, you don't need a separate index on email only - MySQL can use leftmost parts of a composite index. There may be some border cases where the size of an index can slow down your queries, but you should not worry ...
GSON throwing “Expected BEGIN_OBJECT but was BEGIN_ARRAY”?
...d cast the result like that and expect it to magically work ;)
The User guide for Gson Explains how to deal with this:
https://github.com/google/gson/blob/master/UserGuide.md
This will work:
ChannelSearchEnum[] enums = gson.fromJson(yourJson, ChannelSearchEnum[].class);
But this is better:
Ty...
int to hex string
...
Try C# string interpolation introduced in C# 6:
var id = 100;
var hexid = $"0x{id:X}";
hexid value:
"0x64"
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How to dynamically compose an OR query filter in Django?
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Thanks! This was what I was looking for :) Didn't know you could do |=
– Jack Ha
May 12 '09 at 12:43
23
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“cannot resolve symbol R” in Android Studio
In every instance in all of my classes where I reference R.id.something , the R is in red and it says "cannot resolve symbol R". Also every time there is R.layout.something it is underlined in red and says "cannot resolve method setContentView(?)". The project always builds fine. It is annoyin...
Change Image of ImageView programmatically in Android
... @Brave's answer is correct. Using setBackgroundResource() :( did not remove the existing image before using the new image.. so I got two images colliding there. setImageResource() worked tho :). Still .. the post got me on the right track - my thanks for both answers!
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What is jQuery Unobtrusive Validation?
I know what the jQuery Validation plugin is. I know the jQuery Unobtrusive Validation library was made by Microsoft and is included in the ASP.NET MVC framework. But I cannot find a single online source that explains what it is. What is the difference between the standard jQuery Validation librar...