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Rails: create on has_one association
...work. However there is a big difference between has_many relations and has_one relations:
With a has_many relation, shops returns an ActiveRecord collection object, which has methods that you can use to add and remove shops to/from a user. One of those methods is create, which creates a new shop an...
SQL how to increase or decrease one for a int column in one command
...n. During check in or check out, we need to update that Quantity column by one. Is there a way to do this in one action or we have to get the existing value and then add or minus one on top of it?
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What is the best way to solve an Objective-C namespace collision?
Objective-C has no namespaces; it's much like C, everything is within one global namespace. Common practice is to prefix classes with initials, e.g. if you are working at IBM, you could prefix them with "IBM"; if you work for Microsoft, you could use "MS"; and so on. Sometimes the initials refer to ...
JMS Topic vs Queues
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That means a topic is appropriate. A queue means a message goes to one and only one possible subscriber. A topic goes to each and every subscriber.
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Why don't they teach these things in school? [closed]
... I'm really wondering why they don't teach a few of the things I learned sooner in school though. To name a few:
32 Answer...
How do I convert array of Objects into one Object in JavaScript?
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Check out FirstOne's answer for a modern approach.
– Tibos
Feb 10 '19 at 13:14
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One-liner to check whether an iterator yields at least one element?
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Similarly if you need to check if the iterator is empty, one could use all(False for _ in iterator) will check if the iterator is empty. (all returns True if the iterator is empty, otherwise it stops when it sees the first False element)
– KGardevoir
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Can you delete multiple branches in one command with Git?
...ith things like * and -> (for symrefs) which can mess you up in scripts/one-liners.
– Cascabel
Sep 8 '10 at 23:05
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Avoid synchronized(this) in Java?
...int separately.
Some evil code may steal your lock (very popular this one, also has an
"accidentally" variant)
I'm more worried about accidentally. What it amounts to is that this use of this is part of your class' exposed interface, and should be documented. Sometimes the ability of othe...
How can I use inverse or negative wildcards when pattern matching in a unix/linux shell?
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pattern matching operators are recognized.A pattern-list is a list of one or more patterns separated by a |. Composite patterns may be formed using one or more of the following sub-patterns:
?(pattern-list)
Matches zero or one occurrence of the given patterns
*(pattern-list)
Ma...