Be aware of the bug in Rails ActiveSupport String.to_time method

(rdb:1) "2009-09-10 24:00:00".to_time - "2009-09-10 00:00:00".to_time
TypeError Exception: expected numeric or date
(rdb:1) "2009-09-10 24:00:00".to_time.to_time - "2009-09-10 00:00:00".to_time
86400.0
(rdb:1) p "2009-09-10 24:00:00".to_time.class
DateTime
(rdb:1) p "2009-09-10 00:00:00".to_time.class
Time
(rdb:1) 

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Using Proc as a response you pass from the controller sometimes causes 500 error. It happens to be the nature of the Rack/Rails life cycle. Before response was sent/called before Dependencies cleanup in Rails, because it was part of the flow on request-response processing. Now with Rack in front of Rails, the Proc is not called in the request-response flow of the Rails, but in the Rack after Rails finished and if you happens to use Model classes inside the Proc, then you may get empty or partial response and some errors in Apache error logs

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With recent update to Rails 2.3 we found that we cant' strem CSV with FasterCSV anymore

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With a recent upgrade to passenger to 2.0.6 ESPIPE come back again. Another patch ...

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it has a bug or feature in it. yeilding inside with_scope will put scope on the same class

migration

class ...

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Few days ago we upgraded our test server with mysql 5.1.30 (before we had 5.0.27) and tests started to fail. ...   more »

Not well formed XML in Google MAP geocoding result   more »

Rails taking care for your to handle UTF-8. How about when you need to generate a CSV file? It can't be UTF-8. It has to be one of the localized encodings. There is no javascript way to know what is a default locale on the windows client. You may assume it based on your major audience location, (still wrong assumption). ...

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Just demo

$ irb
irb(main):001:0> require 'yaml'
=> true
irb(main):002:0> YAML.load(YAML.dump("\n New Paragraph\nNew Line"))
ArgumentError: syntax error on line 3, ...

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ActiveMerchant Paypal gateway doesn't like 'SuccessWithWarning' from Paypal. How to handle it and save your face (or your website face)   more »

Curl retry easy with alias_method_chain ...   more »

Some time you need a debugger with ability to  step-by-step execution,
inspection and evaluation, not just watch. I use small shell script to achieve this

#!/bin/sh
mongrel-cluster stop
sleep 5
cd $ROR_HOME
/usr/bin/xterm -e "rdebug -n -- ./script/server -p 4001" &
/usr/bin/xterm -e "rdebug -n -- ./script/server -p 4002" &
/usr/bin/xterm -e "rdebug -n -- ./script/server -p 4003" &

The server will stop execution right at the line debugger if defined? Debugger

I don't know how Safari identifies a content-type for the file before it uploaded (extension or magic bit). But when it failed to identify it - nothing is passed to server Example upload CSV file from Safari on Windows ...   more »

I need to parse uploaded vCard (vcf) file for one of the project, I am
working on. There is not that many libraries for Ruby around there.
Well, actually there is only one - vpim

Everything was working just fine with test files I found on the Internet,
until I hit the wall with vcf from Apple Address book. Few surprises:
accent characters or non US ASCII in general plus EMAIL and TEL
without a value ...

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You need to render partial with a collection of hashes (or kind_of?). Probably you control the code, which generate the collection

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Imagine, you have created a great module/class for rails interacting with 3rd party service provider over TCP/IP or you build a ruby extension to one of the libraries, where work with IO is done outside of the ruby itself. While you was building it you didn't pay a lot of attention to handling timeouts, network latency, IO blocks or you name it.

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auto_scope plugin for rails has_many with_scope   more »

if you do rename_column/add/remove in your migration, don't forget to call reset_column_information in the changed class. Otherwise you may have a problem with running migration on an empty DB if you pre-seed data in the migration after change ...   more »