I have lost hours and hours on this one. My subscription confirmations just didn’t work, I have scanned the network traffic with wireshark and my app just didn’t send a response to confirmation request.
To solve this problem all you need to do is open application.conf ande set play.pool value to 2 or higher. Default is one and server can’t responde to a request until the first one is finished so confirmation fails.
One common task that you probably want to learn how to do is spliting a string into an array (like explode function in PHP). You can do this by calling “split” method. By default it will split a string on whitespace, but you can pass it a delimiter. Delimiter can be a string or regular expression.
1 2 3 4 5 6 7 | animals = 'dog wolf cat lynx tiger' animals.split # => ["dog", "wolf", "cat", "lynx", "tiger"] "6534-234-23-45".split "-" # => ["6534", "234", "23", "45"] calc = "45 + 36 - 25 * 14" calc.split /\s*[-+*]\s*/ # => ["45", "36", "25", "14"] |
If you just need to set a simple many-to-many relationship the easiest way to do this is with has_and_belongs_to_many. Here is how your models should look like.
1 2 3 4 5 6 7 | class Post < ActiveRecord::Base has_and_belongs_to_many :tags end class Tag < ActiveRecord::Base has_and_belongs_to_many :posts end |
This association is supported by an additional database table that will store post_id and tag_id for each relationship. This table should be called posts_tags and it will not be created for you, so you will have to create your own migration.
I’m starting to work on my project that is supposed to use PubSubHubbub. I had some difficulty understanding it as I found documentation inadequate. I have managed to get this simple app to work with a public Hub (http://pubsubhubbub.appspot.com/).
All it does is confirm all subscription requests, and when it recieves data it prints it on screen. It uses Sinatra for handling http requests. It’s not much but maybe someone will find it useful.
If you want to put your views in a subfolder and you are getting an import error, all you have to do is create a blank “__init__.py” file within that subfolder and everything should work fine. 
In this post I will try to explain some tricks I use to make python code more readable. These tips won’t make your code shorter and it won’t be better optimized, it will actually use more memory than before, but it will be much easier to understand and edit for someone else.
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If you have non-english names for your models, they will look bad when django admin tries to make plural out of them by adding “s” in the end. Fortunately it is easy to override by defining “verbose_name_plural” in your model. Here is an example:
1 2 3 4 5 6 | class Tag(models.Model): class Meta: verbose_name_plural = "Tagovi" ime = models.CharField(max_length="300") opis = models.TextField(blank = True) |
