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difference between scope and namespace of ruby-on-rails 3 routing
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from the rails guide
"The namespace scope will automatically add :as as well as :module and :path prefixes."
so
namespace "admin" do
resources :contexts
end
is the same as
scope "/admin", as: "admin", module: "admin" do
resources :contexts
end
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Want to find records with no associated records in Rails
...).where( :friends => { :person_id => nil } )
For the hmt it's basically the same thing, you rely on the fact that a person with no friends will also have no contacts:
Person.includes(:contacts).where( :contacts => { :person_id => nil } )
Update
Got a question about has_one in the c...
Add one row to pandas DataFrame
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Consider adding the index to preallocate memory (see my answer)
– FooBar
Jul 23 '14 at 14:22
34
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Is it a good idea to index datetime field in mysql?
...atabase is very broad. I'd say to just make sure that it's normalized and all appropriate columns are indexed (i.e. ones used in joins and where clauses).
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SQL command to display history of queries
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try
cat ~/.mysql_history
this will show you all mysql commands ran on the system
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Call a function with argument list in python
I'm trying to call a function inside another function in python, but can't find the right syntax. What I want to do is something like this:
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What is 'Context' on Android?
...ect. It lets newly-created objects understand what has been going on. Typically you call it to get information regarding another part of your program (activity and package/application).
You can get the context by invoking getApplicationContext(), getContext(), getBaseContext() or this (when in a cl...
PHP case-insensitive in_array function
...ters are required, unless partial matching is desired.) However if you actually want the matching entries returned, I like this solution.
– Darren Cook
Sep 14 '12 at 6:57
2
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Why am I getting tree conflicts in Subversion?
...h of my trunk and was merging changes from my trunk into my branch periodically and everything was working fine. Today I went to merge the branch back down into the trunk and any of the files that were added to my trunk after the creation of my branch were flagged as a "tree conflict". Is there a wa...
Aspect Oriented Programming vs. Object-Oriented Programming
...ics need to be updated on screen. Assume to repaint the graphics you must call "Display.update()". The classical approach is to solve this by adding more code. At the end of each set method you write
void set...(...) {
:
:
Display.update();
}
If you have 3 set-methods, that is not a pro...