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Rails where condition using NOT NIL
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The canonical way to do this with 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 wit...
Check whether or not the current thread is the main thread
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How to read data from a zip file without having to unzip the entire file
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Using multiple property files (via PropertyPlaceholderConfigurer) in multiple projects/modules
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Why use the INCLUDE clause when creating an index?
.../GROUP BY/ORDER BY, but only in the column list in the SELECT clause.
The INCLUDE clause adds the data at the lowest/leaf level, rather than in the index tree.
This makes the index smaller because it's not part of the tree
INCLUDE columns are not key columns in the index, so they are not ordered.
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