Module: ActiveRecord::SnapshotView

Defined in:
lib/activerecord_snapshot_view/snapshot_view.rb

Defined Under Namespace

Modules: ClassMethods Classes: SaveWork

Class Method Summary collapse

Class Method Details

.class_from_symbol(sym) ⇒ Object 



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# File 'lib/activerecord_snapshot_view/snapshot_view.rb', line 37

def self.class_from_symbol(sym)
  eval(sym.to_s.camelize)
end

.included(mod) ⇒ Object 



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# File 'lib/activerecord_snapshot_view/snapshot_view.rb', line 29

def self.included(mod)
  mod.instance_eval do
    class << self
      include ClassMethods
    end
  end
end

.normalize(base_table) ⇒ Object

remove all SnapshotView related tables for a model, making it a normal model again does not require that the SnapshotView module is included on the model class



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# File 'lib/activerecord_snapshot_view/snapshot_view.rb', line 59

def self.normalize(base_table)
  view_tables = ActiveRecord::Base::connection.tables.select{|n| n=~ /^#{base_table}_([[:alpha:]]|switch)$/}

  $stderr << "#{base_table} matches no view_tables\n" if view_tables.empty?
  view_tables.each do |table|
    ActiveRecord::Base::connection.execute( "drop table #{table}" )
  end

end

.prepare_to_migrate(model_sym) ⇒ Object

prepare a SnapshotView model for migration... move all data to the base table, make that current, and remove the other store tables. if the model no longer exists, or is no longer a SnapshotView, catch any errors



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# File 'lib/activerecord_snapshot_view/snapshot_view.rb', line 45

def self.prepare_to_migrate(model_sym)
  begin
    klass = class_from_symbol(model_sym)
    if klass.ancestors.include?(ActiveRecord::SnapshotView)
      klass.prepare_to_migrate
    end
  rescue Exception=>e
    $stderr << "model: #{model_sym} no longer exists?\nignored Exception:\n"
    $stderr << [e.message, *e.backtrace].join("\n")
  end
end