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How do I filter ForeignKey choices in a Django ModelForm?
...rgs)
# access object through self.instance...
self.fields['base_rate'].queryset = Rate.objects.filter(company=self.instance.company)
class ClientAdmin(admin.ModelAdmin):
form = ClientAdminForm
....
You don't need to specify this in a form class, but can do it directly in t...
How to access parent scope from within a custom directive *with own scope* in AngularJS?
... function in these examples but you can use a directive controller as well based on requirement.
Option#1. Through Object literal and from directive html template
index.html
<!DOCTYPE html>
<html ng-app="plunker">
<head>
<meta charset="utf-8" />
<title>Ang...
Where to define custom error types in Ruby and/or Rails?
...below, so that your validations will fail:
def MyModel < ActiveRecord::Base
validate :code_does_not_contain_hyphens
def code_does_not_contain_hyphens
errors.add(:code, "cannot contain hyphens") if code.include?("-")
end
end
When validations are run, this method will piggy-back onto ...
How to format a duration in java? (e.g format H:MM:SS)
...alDuration implements TemporalAccessor {
private static final Temporal BASE_TEMPORAL = LocalDateTime.of(0, 1, 1, 0, 0);
private final Duration duration;
private final Temporal temporal;
public TemporalDuration(Duration duration) {
this.duration = duration;
this.temp...
How to call getClass() from a static method in Java?
...ck has a benefit of being copy/paste safe...
Caution when using this in a Base Class that other classes inherit from:
It is also worth noting that if this snippet is shaped as a static method of some base class then currentClass value will always be a reference to that base class rather than to an...
Using Sinatra for larger projects via multiple files
...g:
thin -R config.ru start
Edit: I'm now maintaining my own Monk skeleton based on the below called Riblits. To use it to copy my template as the basis for your own projects:
# Before creating your project
monk add riblits git://github.com/Phrogz/riblits.git
# Inside your empty project directory
...
Can you get DB username, pw, database name in Rails?
...ain the necessary information from it:
config = Rails.configuration.database_configuration
host = config[Rails.env]["host"]
database = config[Rails.env]["database"]
username = config[Rails.env]["username"]
password = config[Rails.env]["password"]
See the documentation for Rails::Configurati...
Event system in Python
...even source classes to derive from pydispatch.Dispatcher.
buslane is class-based, supports single- or multiple handlers and facilitates extensive type hints.
Pithikos' Observer/Event is a lightweight design.
Publish-subscribe libraries:
blinker has some nifty features such as automatic disconnecti...
How to find out client ID of component for ajax update/render? Cannot find component with expression
... end result is the same:
Identify the UIComponent that will be the base for searching, by stopping as soon as one of the following conditions is met:
If the search expression begins with the the separator character (called an "absolute" search expression), the base will be the root U...
Comparison of Android networking libraries: OkHTTP, Retrofit, and Volley [closed]
...for you.
That being said, if you are going to attempt to do your own HTTP-based streaming, OkHTTP should handle that scenario; I don't recall how well Volley would handle that scenario. Neither Retrofit nor Picasso are designed for that.
...