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Rails where condition using NOT NIL

...h Rails 3: Foo.includes(:bar).where("bars.id IS NOT NULL") ActiveRecord 4.0 and above adds where.not so you can do this: Foo.includes(:bar).where.not('bars.id' => nil) Foo.includes(:bar).where.not(bars: { id: nil }) When working with scopes between tables, I prefer to leverage merge so that...
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How do I create an immutable Class?

... answered Dec 9 '08 at 11:47 Blair ConradBlair Conrad 190k2424 gold badges124124 silver badges107107 bronze badges ...
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Applying function with multiple arguments to create a new pandas column

... 141 Alternatively, you can use numpy underlying function: >>> import numpy as np >>...
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What is this CSS selector? [class*=“span”]

... 4 Answers 4 Active ...
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How to add global ASP.Net Web Api Filters?

...nFilterAttribute ) but I am unable to get it to work inside of ASP.Net MVC 4. I tried adding it to the RegisterGlobalFilters() method but that didn't work. ...
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How to switch back to 'master' with git?

... 249 You need to checkout the branch: git checkout master See the Git cheat sheets for more infor...
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How to do error logging in CodeIgniter (PHP)

... | edited Jun 24 '16 at 10:28 A J 3,3651212 gold badges3434 silver badges4949 bronze badges a...
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How do I interpret precision and scale of a number in a database?

... 406 Numeric precision refers to the maximum number of digits that are present in the number. ie ...
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Telling gcc directly to link a library statically

... 194 It is possible of course, use -l: instead of -l. For example -l:libXYZ.a to link with libXYZ.a. ...