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Find all records which have a count of an association greater than zero
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[10] pry(main)> Comment.distinct.pluck :article_id
=> [43, 34, 45, 55, 17, 19, 1, 3, 4, 18, 44, 5, 13, 22, 16, 6, 53]
[11] pry(main)> _.size
=> 17
[12] pry(main)> Article.joins(:comments).size
=> 45
[13] pry(main)> Article.joins(:comments).distinct.size
=> 17
[14] pry(ma...
difference between foldLeft and reduceLeft in Scala
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305
Few things to mention here, before giving the actual answer:
Your question doesn't have anythi...
How to perform mouseover function in Selenium WebDriver using Java?
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edited Dec 16 '13 at 8:57
answered Jun 25 '13 at 10:03
M...
How to mount a host directory in a Docker container
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What is the $? (dollar question mark) variable in shell scripting? [duplicate]
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edited Jun 29 '17 at 10:35
Melvyn
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answered Jul 2...
Objective-C formatting string for boolean?
...is for true .
– Onder OZCAN
May 4 '15 at 12:40
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Read a variable in bash with a default value
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295
You can use parameter expansion, e.g.
read -p "Enter your name [Richard]: " name
name=${name:-Ri...
How to quit a java app from within the program
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JonJon
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What is the difference between HTTP_HOST and SERVER_NAME in PHP?
...om my current XAMPP environment on Windows XP (Apache HTTPD 2.2.1 with PHP 5.2.8), started it, created a PHP page which prints the both values, created a Java test application using URLConnection to modify the Host header and tests taught me that this is indeed (incorrectly) the case.
After first s...
how to convert an RGB image to numpy array?
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awiebe
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answered Oct 15 '11 at 8:02
Andrey KamaevAndrey ...