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Saving grid.arrange() plot to file
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147
grid.arrange draws directly on a device. arrangeGrob, on the other hand, doesn't draw anything...
Select element based on multiple classes
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614
You mean two classes? "Chain" the selectors (no spaces between them):
.class1.class2 {
/* ...
Nested attributes unpermitted parameters
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187
Seems there is a change in handling of attribute protection and now you must whitelist params ...
How to use sessions in an ASP.NET MVC 4 application?
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162
Try
//adding data to session
//assuming the method below will return list of Products
var pr...
How to create arguments for a Dapper query dynamically
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139
Yes:
var dbArgs = new DynamicParameters();
foreach(var pair in args) dbArgs.Add(pair.Key, pai...
What does the `#` operator mean in Scala?
... println("Got my B!")
}
Now let's try something with it:
scala> val a1 = new A
a1: A = A@2fa8ecf4
scala> val a2 = new A
a2: A = A@4bed4c8
scala> a2.f(new a1.B)
<console>:11: error: type mismatch;
found : a1.B
required: a2.B
a2.f(new a1.B)
^
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Run a callback only if an attribute has changed in Rails
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Rails 5.1+
class Page < ActiveRecord::Base
before_save :do_something, if: :will_save_change_to_status_id?
private
def do_something
# ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github....
How to determine the longest increasing subsequence using dynamic programming?
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19 Answers
19
Active
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Logger slf4j advantages of formatting with {} instead of string concatenation
...lly significant if your have dense logging statements.
(Prior to SLF4J 1.7) But only two parameters are possible
Because the vast majority of logging statements have 2 or fewer parameters, so SLF4J API up to version 1.6 covers (only) the majority of use cases. The API designers have provided ...
Using IoC for Unit Testing
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131
Generally speaking, a DI Container should not be necessary for unit testing because unit testi...