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A migration to add unique constraint to a combination of columns
...ship.create!(user_id: user_id, post_id: post_id)
Fully runnable example: https://gist.github.com/Dorian/9d641ca78dad8eb64736173614d97ced
db/schema.rb generated: https://gist.github.com/Dorian/a8449287fa62b88463f48da986c1744a
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Java: What is the difference between and ?
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Use cases for NoSQL [closed]
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I strongly recommend this talk by Martin Fowler:
https://www.youtube.com/watch?v=qI_g07C_Q5I
ABSTRACT:
Martin gives a rapid introduction to NoSQL databases: where they came from, the nature of the data models they use, and the different way you have to think about consiste...
Unable to access JSON property with “-” dash
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difference between iframe, embed and object elements
... when you must have Mixed content.
Mixed content means that when you have https but your resource is from http.
Reference: https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content
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How can I remove 3 characters at the end of a string in php?
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Using headers with the Python requests library's get method
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Importing a Swift protocol in Objective-C class
.... You can learn more about mixing and matching Objective-C and Swift here: https://developer.apple.com/library/content/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html
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javascript remove “disabled” attribute from html input
...eem to work in inline mode, but there is a workaround: method 3.
see demo https://jsfiddle.net/eliz82/xqzccdfg/
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C++ semantics of `static const` vs `const`
...implies static at file scope
This is the quote for what was mentioned at: https://stackoverflow.com/a/3709257/895245
C++17 n4659 standard draft 6.5 "Program and linkage":
3
A name having namespace scope (6.3.6) has internal linkage if it is the name of
(3.1) — a variable, function ...