Creating a list of A-Z and 0-9 is very simple in Ruby. You may need to do this for numerous reasons but the writing of this tip came about when needing to create a memorable word interface, like that of banks. Continue reading
Recently I’ve been running into an interesting problem (at least, to me). Within a web application I am working on I found what I thought was a sporadic error occurring, which resulted in the need to restart Apache in order to temporarily fix it. That was, until I made a change to the controller and thus the issue appeared again, until I restarted Apache. The error:
uninitialized constant Frontend::User::ForgottenPasswordController::User
This puzzled me for quite a while, but I continued to develop while every now and again I would come up against this and look for answers. I found nothing, but knew the following:
- User constant (model class) exists and works fine
- This only happened in specific controllers
If you need to split a string based on uppercase values, for example “ComputeAsAService” in order to provide a readable string “Compute As A Service” you can do so simply by using regular expressions, in particular you can use the lookahead operator “?=”.
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str = "ComputeAsAService" parts = str.split(/(?=[A-Z])/) >> ["Compute", "As", "A", "Service"]
When I first started writing in ruby I found myself needing to know the ruby method equivalents to specific PHP functions. These methods are widely used by myself for debugging and day to day checking of data types.
PHP’s die(‘message’) becomes
PHP’s get_class_methods() becomes
PHP’s in_array() becomes
If you are familiar with PHP you will know that strings can be contained within single quotes or double quotes. More often than not developers tend to always use double quotes, despite the context of the string.
While this is OK in principle, double quotes take more processing time than that of single quotes (despite being minimal). This is because PHP expects to find variables within double quoted strings and parse them. Continue reading
More often than not while writing in PHP, you will need to debug the code you have written and/or find out relevant information about classes. This tip outlines different debugging methods such as print_r, var_dump and error logging as well as useful class functions. Continue reading
Is the following error familiar to you?
Fatal error: Allowed memory size of XXX bytes exhausted
It is to me, and recently I’ve written an import script that reads the contents of 10 XML files. These files accumulate a total of 14.9MB in size. The XML files contain page content (A good 10,000), each page has references to images and PDFs which needed to be downloaded, stored on the filesystem in the same directory structure as well as imported into an asset manager, again in the same structure. Once the assets have been downloaded the script stores the contents of the XML files. Continue reading