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No route matches “/users/sign_out” devise rails 3
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K M Rakibul Islam
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answered Jul 2 '11 at 14:34
Jessie DedeckerJessie Dedecker
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Postgresql - change the size of a varchar column to lower length
...ill lock and rewrite the entire table while it's running.
Make sure you read the Character Types section of the docs before changing this. All sorts of weird cases to be aware of here. The length check is done when values are stored into the rows. If you hack a lower limit in there, that will no...
How to amend a commit without changing commit message (reusing the previous one)?
... --amend --no-edit to get your result.
Note that this will not include metadata from the other commit such as the timestamp which may or may not be important to you.
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Heroku/GoDaddy: send naked domain to www [closed]
...redirect to the www domain. I am using Heroku and have the domain from GoDaddy. Because of Heroku, my A records are already set up as:
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Usage of protocols as array types and function parameters in swift
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Community♦
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answered Jul 22 '14 at 14:25
DarkDustDarkDust
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What is the difference between the bridge pattern and the strategy pattern?
I tried to read many articles on dofactory , wikipedia and many sites.
I have no idea on differences between bridge pattern and the strategy pattern.
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difference between primary key and unique key
... be one primary key in a table
In some DBMS it cannot be NULL - e.g. MySQL adds NOT NULL
Primary Key is a unique key identifier of the record
Unique Key:
Can be more than one unique key in one table
Unique key can have NULL values
It can be a candidate key
Unique key can be NULL ; multiple rows ...
Multiple Inheritance in C#
Since multiple inheritance is bad (it makes the source more complicated) C# does not provide such a pattern directly. But sometimes it would be helpful to have this ability.
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Get all unique values in a JavaScript array (remove duplicates)
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The constructor of Set takes an iterable object, like Array, and the spread operator ... transform the set back into an Array. Thanks to Lukas Liese for hint in comment.
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How to check if a file is a valid image file?
...l be a magic number for various file formats. You could check for this in addition to your exception checking above.
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