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PostgreSQL query to return results as a comma separated list
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You can use the array() and array_to_string() functions togetter with your query.
With SELECT array( SELECT id FROM table ); you will get a result like: {1,2,3,4,5,6}
Then, if you wish to remove the {} signs, you can just use the array_to_string() ...
Rails: create on has_one association
...) would 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...
Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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Unix shell script to truncate a large file
...an application when it reaches say 3GB of space. I know that the below command would do it :
4 Answers
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How do I compare two files using Eclipse? Is there any option provided by Eclipse?
...orer / Navigator with control-click. Now right-click on one of the files, and the following context menu will appear. Select Compare With / Each Other.
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iOS - How to set a UISwitch programmatically
... answered Oct 17 '11 at 21:34
Andrew_LAndrew_L
2,94222 gold badges1616 silver badges1818 bronze badges
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Can I publish a private NuGet package?
...to use NuGet to make this assembly avaiable to other projects that my team and similar teams at my company are working on. However, the assembly isn't really code that I want to share with the world.
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Extract TortoiseSVN saved password
...I. The tool above uses sample code from Obviex to interface with this API and perform decryption.
In order for it to work, you must have access to the same Windows user account you were running under when you checkmarked the "Save authentication" checkbox. This is because the Windows Data Protect...
XML schema or DTD for logback.xml?
...ema or DTD for logback.xml file to have at least the very basic validation and auto-completion in IDEs like IDEA or Eclipse, but I never saw any solution.
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Run a callback only if an attribute has changed in Rails
...ods/Dirty.html
Before Saving (OPTIONAL CHANGE)
After modifying an object and before saving to the database, or within the before_save filter:
changes should now be changes_to_save
changed? should now be has_changes_to_save?
changed should now be changed_attribute_names_to_save
<attribute>_...