14 12 / 2012
Rails 3: Custom validation messages for the same column name using some other column value
Problem: We wanted to add custom validation message, and call the same mysql table column with different names depending on the value of some other field. After much googling I couldn’t find any suitable answers. Posting the solution I came up with, so that it can be of help to others:
Solution:
I couldn’t find solutions using procs, interpolations, etc. I wrote a custom validator, as all the columns are available there. Below is the sample code:
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| class Link < ActiveRecord::Base | |
| validate :url_presence | |
| def url_presence | |
| errors.add(:base, "#{Link.url_label(linktype)} can't be blank.") if url.blank? | |
| end | |
| def self.url_label(linktype) | |
| {"web" => "Web URL", "video" => "Video URL", "audio" => "Audio URL", "ecommerce" => "Shop URL", | |
| "page" => "Page number", "email" => "Email"}[linktype] || "URL" | |
| end | |
| end |
Please note that linktype and url are columns in the links table.
Also answered a related question on Stackoverflow here: