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# ATTRIBUTION NOTE: This module has been mostly copied from the
# lazy_columns gem. The original code can be found at:
# https://github.com/jorgemanrubia/lazy_columns
module Marty
module LazyColumnLoader
extend ActiveSupport::Concern
module ClassMethods
def lazy_load(*columns)
return unless table_exists?
columns = columns.collect(&:to_s)
exclude_columns_from_default_scope columns
define_lazy_accessors_for columns
# allow introspection of lazy-loaded column list
const_set(:LAZY_LOADED, columns)
end
private
def exclude_columns_from_default_scope(columns)
default_scope {
select((column_names - columns).map {
|column_name|
"#{table_name}.#{column_name}"
})
}
end
def define_lazy_accessors_for(columns)
columns.each { |column| define_lazy_accessor_for column }
end
def define_lazy_accessor_for(column)
define_method column do
unless has_attribute?(column)
changes_before_reload = self.changes.clone
self.reload
changes_before_reload.each{
|attribute_name, values|
self.send("#{attribute_name}=", values[1])
}
end
read_attribute column
end
end
end
end
end
if ActiveRecord::Base.respond_to?(:lazy_load)
$stderr.puts "ERROR: Method `.lazy_load` already defined in " +
"`ActiveRecord::Base`. This is incompatible with LazyColumnLoader " +
"and the module will be disabled."
else
ActiveRecord::Base.send :include, Marty::LazyColumnLoader
end
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103 entries across 103 versions & 1 rubygems