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java.net.UnknownHostException: Invalid hostname for server: local
...ping: cannot resolve myHostName: Unknown host then add an entry into your /etc/hosts file.
For that edit /etc/hosts file and add following:
127.0.0.1 myHostName
Hope it helps.
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impr...
Uses for Optional
...sirable" ways (e.g. as method parameters, in collections, in constructors, etc.) if that really is not intended usage?
– skomisa
Feb 20 '15 at 0:33
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Why are joins bad when considering scalability?
... learn of things like the various normal forms (1st, 2nd, 3rd, Boyce-Codd, etc.), and we learn about different types of keys (primary, foreign, alternate, unique, etc.) and how these things fit together to design a database. And we learn the rudiments of SQL as well as manipulating both structure a...
Using switch statement with a range of value in each case?
... great and is simple. Also if you want to select numbers not in the range all you need is if(!isBetween... , good job.
– a54studio
Jul 20 '13 at 13:43
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An error occurred while installing pg (0.17.1), and Bundler cannot continue
I just installed Rails 4.0.2 and when creating a new app, in the bundle stage I get:
16 Answers
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What's the complete range for Chinese characters in Unicode?
...cters in this block are Chinese characters(also used in Japanese or Korean etc.).
Most of characters in CJK Unified Ideograohs Ext (Except Ext F, only 17% in Ext F are chinese characters), are traditional chinese characters, which are rarely used in China.
〇 is the chinese character form of zero a...
How do I remove code duplication between similar const and non-const member functions?
... C &>(*this).get());
}
char c;
};
The two casts and function call may be ugly but it's correct. Meyers has a thorough explanation why.
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Remove empty array elements
... of strings, you can simply use array_filter(), which conveniently handles all this for you:
print_r(array_filter($linksArray));
Keep in mind that if no callback is supplied, all entries of array equal to FALSE (see converting to boolean) will be removed. So if you need to preserve elements that ...
How to change the foreign key referential action? (behavior)
... means that if you delete a row from the parent table (Users in this case) all referencing rows from the child table (UserDetails) are also deleted.
– edruid
Jan 11 '18 at 14:20
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what is the best way to convert a json formatted key value pair to ruby hash with symbol as key?
... string key
}
}
Method 1: JSON.parse - symbolizes all keys recursively => Does not preserve original mix
JSON.parse( h.to_json, {:symbolize_names => true} )
=> { :youtube => { :search=> "daffy", :history => ["goofy", "mickey"] } }
Method 2: ActiveSup...