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XPath: How to select nodes which have no attributes?
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//node[not(@*)]
That's the XPath to select all nodes named "node" in the document without any attributes.
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Why is using the rails default_scope often recommend against?
...to show unpublished (private) posts. So far so good.
2.1.1 :001 > Post.all
Post Load (0.2ms) SELECT "posts".* FROM "posts" WHERE "posts"."published" = 't'
Well this is pretty much what we expect. Now lets try:
2.1.1 :004 > Post.new
=> #<Post id: nil, title: nil, published: true...
How are “mvn clean package” and “mvn clean install” different?
...exactly are the differences between mvn clean package and mvn clean install ? When I run both of these commands, they both seem to do the same thing.
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Convert data.frame column format from character to factor
...e to the world of R.
mtcars #look at this built in data set
str(mtcars) #allows you to see the classes of the variables (all numeric)
#one approach it to index with the $ sign and the as.factor function
mtcars$am <- as.factor(mtcars$am)
#another approach
mtcars[, 'cyl'] <- as.factor(mtcars[...
Git: Show all of the various changes to a single line in a specified file over the entire git histor
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@Rob - thanks for this - small edit to your script though - putting just the filename only shows commits that just affect that file - if a commit referenced other files it is not listed
– Adrian Cornish
Sep 7 '12 ...
How would one call std::forward on all arguments in a variadic function?
...mpiler I would do this with real variadic templates. How though, would I call std::forward on the arguments?
1 Answer
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jQuery: select all elements of a given class, except for a particular Id
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From the documentation: All selectors are accepted inside :not(), for example: :not(div a) and :not(div,a) so just use the comma delimited selectors to do multiple (".thisclass:not(#thisid,#thatid)").doAction();
– Chase
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Why shouldn't all functions be async by default?
...kind words. It is indeed an awesome feature and I am glad to have been a small part of it.
If all my code is slowly turning async, why not just make it all async by default?
Well, you're exaggerating; all your code isn't turning async. When you add two "plain" integers together, you're not awa...
How to copy in bash all directory and files recursive?
... So, to clarify, capital -R option will copy the root dir again; small -r option keeps the root paths the same.
– AnneTheAgile
Aug 7 '14 at 13:27
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Difference between rake db:migrate db:reset and db:schema:load
...drop, db:setup
db:migrate:reset does db:drop, db:create, db:migrate
Typically, you would use db:migrate after having made changes to the schema via new migration files (this makes sense only if there is already data in the database). db:schema:load is used when you setup a new instance of your app...