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A migration to add unique constraint to a combination of columns
... unique: true
Trying to create two similar records will throw a database error (Postgres in my case):
ActiveRecord::RecordNotUnique: PG::UniqueViolation: ERROR: duplicate key value violates unique constraint "index_ownerships_on_user_id_and_post_id"
DETAIL: Key (user_id, post_id)=(1, 1) already...
How can I disable HREF if onclick is executed?
...tn-loading is added to the clicked link, then if successful a checkmark(on error an X) replaces the loading animation. I don't want the button to be able to be clicked again in some instances(for both success and error), using this I can simply $(elemnent).addClass('disabled') and easily achieve the...
Cross compile Go on OSX?
...arted by trying to do: $ GOARCH=386 GOOS=linux go build app.go and getting error # runtime /usr/local/go/src/pkg/runtime/extern.go:137: undefined: theGoos /usr/local/go/src/pkg/runtime/extern.go:137: cannot use theGoos as type string in const initializer
– ljgww
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Sorting an array of objects in Ruby by object attribute?
...at kind of object is @created_at? Does it define <=>? What kind of errors are you getting? etc, etc, ad nauseum. In other words, we need more detail than "but no luck for me".
– rampion
May 20 '09 at 13:19
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private final static attribute vs private final attribute
...estStatic();
t1.a = 10;
TestStatic t2 = new TestStatic();
t1.a = 20; // ERROR, CAN'T BE ALTERED AFTER THE FIRST INITIALIZATION.
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Python multiprocessing PicklingError: Can't pickle
I am sorry that I can't reproduce the error with a simpler example, and my code is too complicated to post. If I run the program in IPython shell instead of the regular Python, things work out well.
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Getting file names without extensions
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I got the error " 'builder' does not exist in the current context ". I added 'system.Text' but still got same error. What is the reason?
– ffttyy
Jan 27 '16 at 19:52
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Defining TypeScript callback type
...e member variable to your function, then call a method - ugly and prone to errors, because setting the variable first is part of the contract of calling the method.
– David
Apr 17 '15 at 13:05
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Laravel redirect back to original destination after login
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But before that, Laravel shows a 403 error page without any action. Instead, how to redirect automatically to the login page, and then to the intended page??
– Pathros
Aug 23 at 4:23
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How to define a List bean in Spring?
...ould do this with the util:list but couldn't get it work due to conversion errors.
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