大约有 43,000 项符合查询结果（耗时：0.0777秒） [XML]
Find all records which have a count of an association greater than zero
...s an example
[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
[1...
What are the applications of binary trees?
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434
To squabble about the performance of binary-trees is meaningless - they are not a data structu...
How to simulate a button click using code?
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448
there is a better way.
View.performClick();
http://developer.android.com/reference/android/...
How to use JNDI DataSource provided by Tomcat in Spring?
... 8 JNDI Datasource HOW-TO
Tomcat 8 Context Resource Links Reference
Spring 4 JEE JNDI Lookup XML Schema Reference
Spring 4 JndiObjectFactoryBean Javadoc
Edit: This answer has been updated for Tomcat 8 and Spring 4. There have been a few property name changes for Tomcat's default datasource resour...
How do I add multiple arguments to my custom template filter in a django template?
...mple, if you want a filter that checks if variable X is in the list [1,2,3,4] you will want a template filter that looks like this:
{% if X|is_in:"1,2,3,4" %}
Now we can create your templatetag like this:
from django.template import Library
register = Library()
def is_in(var, args):
if arg...
What's the difference between and , and ?
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reformed
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answered Nov 7 '08 at 11:07
splattnesplattne
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is it possible to change values of the array when doing foreach in javascript?
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498
The callback is passed the element, the index, and the array itself.
arr.forEach(function(par...
Algorithm to randomly generate an aesthetically-pleasing color palette [closed]
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430
You could average the RGB values of random colors with those of a constant color:
(example in...
Make xargs handle filenames that contain spaces
... |
edited Jul 23 at 8:04
gelonida
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answered Se...
How to find time complexity of an algorithm
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405
How to find time complexity of an algorithm
You add up how many machine instructions it w...