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Size: 1.33 KB
Versions: 12
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Stored size: 1.33 KB
Contents
# An ActiveRecord extension that will let you automatically truncate
# certain attributes to the maximum length allowed by the DB.
#
# require 'truncate_to_db_limit'
# class Something < ActiveRecord::Base
# include TruncateToDbLimit
# truncate_to_db_limit :short_attr, :short_attr2
# #...
#
# Truncation is done in a before_validate hook, so won't happen until
# you try to save.
#
module TruncateToDbLimit
extend ActiveSupport::Concern
included do
class_attribute :'_truncate_to_db_limit_attributes', instance_accessor: false
before_validation :do_truncate_to_db_limit!
def self.truncate_to_db_limit(*attribute_names)
self._truncate_to_db_limit_attributes = attribute_names
end
end
def do_truncate_to_db_limit!
self.class._truncate_to_db_limit_attributes.each do |attribute_name|
ar_attr = self.class.columns_hash[attribute_name.to_s]
unless ar_attr
raise ArgumentError.new("truncate_to_db_limit #{attribute_name}: No such attribute")
end
limit = ar_attr.limit
unless limit && limit.to_i != 0
raise ArgumentError.new("truncate_to_db_limit #{attribute_name}: Limit not known")
end
normalized = send(attribute_name).try {|v| v.slice(0, limit)}
send("#{attribute_name}=", normalized)
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems