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Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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Setting transparent images background in IrfanView
I have some PNG images which consist of a black shape and a transparent background.
Unfortunately, IrfanView shows transparent background as black color, so I see just black on black. I've found in Irfan settings that I can change the window's background color, but it changes only around the image, ...
Why did Rails4 drop support for “assets” group in the Gemfile
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Previously the assets group existed to avoid unintended compilation-on-demand in production. As Rails 4 doesn't behave like that anymore, it made sense to remove the asset group.
This is explained in more detail in the commit that changed that. I extracted some quotes with the actual answer.
Some ...
UUID max character length
We are using UUID as primary key for out oracle DB, and trying to determine an appropriate max character length for the VARCHAR. Apparently this is 36 characters but we have noticed UUID'S generated which are longer than this - up to 60 characters in length.
Does anyone know a suitable max char leng...
Chrome extension: force popup.html to close
...nt listener to the background page. The background page triggers the event and the foreground responds by closing itself.
– Sean Anderson
Dec 20 '14 at 1:02
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Git remote branch deleted, but still it appears in 'branch -a'
...ary? Seems really bad to leave these non-existent branch names in the list and not automatically prune them.
– akronymn
Feb 27 '17 at 20:20
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How does Git handle symbolic links?
If I have a file or directory that is a symbolic link and I commit it to a Git repository, what happens to it?
4 Answers
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Best practices around generating OAuth tokens?
...before,
Our first token is an encrypted BLOB with username, token secret and expiration etc. The problem is that we can't revoke tokens without any record on host.
So we changed it to store everything in database and the token is simply an random number used as the key to the database. It has an u...
How can I order a List?
...annot be changed. The requirements are very specifically to sort a List. And the cost associated with this answer is non-trivial and also needless. It literally gains nothing. It adds complexity to the code, it is less concise, it's less efficient, there is literally nothing but disadvantages he...
What is the meaning of the CascadeType.ALL for a @ManyToOne JPA association
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+1 for the best and shortest explanation of mappedBy I've ever come across.
– Ridcully
Sep 30 '14 at 6:19
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