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OO Design in Rails: Where to put stuff
I'm really enjoying Rails (even though I'm generally RESTless), and I enjoy Ruby being very OO. Still, the tendency to make huge ActiveRecord subclasses and huge controllers is quite natural (even if you do use a controller per resource). If you were to create deeper object worlds, where would you p...
:not(:empty) CSS selector is not working?
...idered empty by the HTML definition of "empty", since the content model of all void elements is always empty. So they will always match the :empty pseudo-class, whether or not they have a value. This is also why their value is represented by an attribute in the start tag, rather than text content wi...
An algorithm for inflating/deflating (offsetting, buffering) polygons
...re written in Delphi, C++ and C#. It has a very unencumbered Boost license allowing it to be used in both freeware and commercial applications without charge.
Polygon offsetting can be performed using one of three offset styles - squared, round and mitered.
...
Check if a table exists in Rails
...? 'kittens'
In Rails 2, 3 & 4 the API is about tables.
# Listing of all tables and views
ActiveRecord::Base.connection.tables
# Checks for existence of kittens table/view (Kitten model)
ActiveRecord::Base.connection.table_exists? 'kittens'
Getting the status of migrations:
# Tells you all...
Matplotlib transparent line plots
...
After I plotted all the lines, I was able to set the transparency of all of them as follows:
for l in fig_field.gca().lines:
l.set_alpha(.7)
EDIT: please see Joe's answer in the comments.
...
How to force a html5 form validation without submitting it via jQuery
...ckValidity()) {
// If the form is invalid, submit it. The form won't actually submit;
// this will just cause the browser to display the native HTML5 error messages.
$myForm.find(':submit').click();
}
Hope this helps. Keep in mind that HTML5 validation is not supported in all browsers.
...
Get key by value in dictionary
...oes not imply that it was not intended to be used as such. Not helpful at all.
– Tropicalrambler
Jan 8 at 17:52
Would...
How to tell which version of a gem a rails app is using
...gating a rails app - the prod server has two version of a specific gem installed, how can I tell which version the prod app is using?
...
What's the best way to put a c-struct in an NSArray?
...
@Joe Blow @Catfish_Man It actually copies the structure p, not a pointer to it. The @encode directive provides all the information necessary about how big the structure is. When you release the NSValue (or when the array does), its copy of the structure i...
Git: list only “untracked” files (also, custom commands)
...he alias line, or where is that documented?
– We Are All Monica
Sep 27 '10 at 6:31
@takeshin How to get only parent di...