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Find all records which have a count of an association greater than zero
...ple
[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...
Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly
...penSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007
debug1: Connecting to heroku.com [50.19.85.156] port 22.
debug1: Connection established.
debug1: identity file /c/Wrong/Directory/.ssh/identity type -1
debug1: identity file /c/Wrong/Directory/.ssh/id_rsa type -1
debug1: identity file /c/Wrong/Directory/.ssh/...
Passing a method as a parameter in Ruby
...s|
sigma = args.first || 10.0
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end
def weightedknn(data, vec1, k = 5, weightf = gaussian)
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weight = weightf.call(dist)
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end
Just note that you can't set a default argument in a block declaration like that. So you need to use a splat and setup the default in the proc code itsel...
javascript set a variable if undefined
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edited Mar 24 at 6:25
Viktor Borítás
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answered Mar 23 '11 at 18...
How to use JNDI DataSource provided by Tomcat in Spring?
...resql.Driver"
initialSize="20"
maxWaitMillis="15000"
maxTotal="75"
maxIdle="20"
maxAge="7200000"
testOnBorrow="true"
validationQuery="select 1"
/>
</GlobalNamingResources>
And r...
Meaning of numbers in “col-md-4”,“ col-xs-1”, “col-lg-2” in Bootstrap
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5 Answers
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Best practices for circular shift (rotate) operations in C++
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105
See also an earlier version of this answer on another rotate question with some more details abo...
What's the difference between VARCHAR and CHAR?
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Anon.Anon.
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What is the purpose of flush() in Java streams?
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Sergey Brunov
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answered Feb 26 '10 at 7:40
codaddictcodaddict
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how to show progress bar(circle) in an activity having a listview before loading the listview with d
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175
There are several methods of showing a progress bar (circle) while loading an activity. In your ...