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Rails: Why does find(id) raise an exception in rails? [duplicate]
If there is no user with an id of 1 in the database, trying User.find(1) will raise an exception.
2 Answers
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What is the best Battleship AI?
...ble positions (weighted).
For random shots, compute best location to shoot based on the likelihood of one of the unsunk ships overlapping the location.
adaptive algorithm which places ships in locations where the opponent is statistically less likely to shoot.
adaptive algorithm which prefers to sho...
jQuery: count number of rows in a table
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@DevlshOne That is not true, length is not zero base, check the documentation: api.jquery.com/length
– Miguel
May 1 '13 at 16:01
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How to add include path in Qt Creator?
...ur own build system, you create a project by selecting "Import of Makefile-based project". This will create some files in your project directory including a file named <your project name>.includes. In that file, simply list the paths you want to include, one per line. Really all this does i...
What is the meaning of the 'g' flag in regular expressions?
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Will give example based on string. If we want to remove all occurences from a
string.
Lets say if we want to remove all occurences of "o" with "" from "hello world"
"hello world".replace(/o/g,'');
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How to check if a DateTime occurs today?
...s a DateTime object
.NET is smart enough to determine you want to compare based on Date only and uses that for the internal Compare. Not sure why, and actually having trouble finding documentation for this behaviour.
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Extract a regular expression match
...nces in 'See also':
‘regmatches’ for extracting matched substrings based on the results of
‘regexpr’, ‘gregexpr’ and ‘regexec’.
So this will work, and is fairly simple:
txt <- "aaa12xxx"
regmatches(txt,regexpr("[0-9]+",txt))
#[1] "12"
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How to view DLL functions?
...tBrains.
https://www.jetbrains.com/decompiler/
dotPeek is a free tool based on ReSharper. It can reliably decompile
any .NET assembly into C# or IL code.
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Cannot lower case button text in android studio
...forementioned attribute. Here's what it had <resources> <!-- Base application theme. --> <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar"> <!-- Customize your theme here. --> </style> </resources>
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Parameterize an SQL IN clause
... not open to SQL injection. The only injected text into CommandText is not based on user input. It's solely based on the hardcoded "@tag" prefix, and the index of an array. The index will always be an integer, is not user generated, and is safe.
The user inputted values are still stuffed into param...