Module: Ignorable::ClassMethods

Defined in:
lib/ignorable.rb

Instance Method Summary collapse

Instance Method Details

#columns ⇒ Object

:nodoc:



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# File 'lib/ignorable.rb', line 12

def columns # :nodoc:
  @columns ||= super.reject{|col| ignored_column?(col)}
end

#ignore_columns(*columns) ⇒ Object Also known as: ignore_column

Prevent Rails from loading a table column. Useful for legacy database schemas with problematic column names, like ‘class’ or ‘attributes’.

class Topic < ActiveRecord::Base
  ignore_columns :attributes, :class
end

Topic.new.respond_to?(:attributes) => false



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# File 'lib/ignorable.rb', line 25

def ignore_columns(*columns)
  self.ignored_columns ||= []
  self.ignored_columns += columns.map(&:to_s)
  reset_column_information
  descendants.each(&:reset_column_information)
  self.ignored_columns.tap(&:uniq!)
end

#ignored_column?(column) ⇒ Boolean

Has a column been ignored? Accepts both ActiveRecord::ConnectionAdapter::Column objects, and actual column names (‘title’)



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# File 'lib/ignorable.rb', line 37

def ignored_column?(column)
  self.ignored_columns.present? && self.ignored_columns.include?(
    column.respond_to?(:name) ? column.name : column.to_s
  )
end

#reset_ignored_columns ⇒ Object 



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# File 'lib/ignorable.rb', line 43

def reset_ignored_columns
  self.ignored_columns = []
  reset_column_information
end