Class: Fiona7::TableSwitcher

Inherits:
Object
  • Object
show all
Defined in:
lib/fiona7/table_switcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, table_suffix) ⇒ TableSwitcher

Returns a new instance of TableSwitcher.



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# File 'lib/fiona7/table_switcher.rb', line 6

def initialize(klass, table_suffix)
  self.klass = klass
  self.table_prefix = klass.table_name_prefix
  self.table_suffix = table_suffix
  self.table_name = "#{self.table_prefix}#{self.table_suffix}"
end

Instance Attribute Details

#klass ⇒ Object

Returns the value of attribute klass.



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# File 'lib/fiona7/table_switcher.rb', line 4

def klass
  @klass
end

#table_name ⇒ Object

Returns the value of attribute table_name.



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# File 'lib/fiona7/table_switcher.rb', line 4

def table_name
  @table_name
end

#table_prefix ⇒ Object

Returns the value of attribute table_prefix.



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# File 'lib/fiona7/table_switcher.rb', line 4

def table_prefix
  @table_prefix
end

#table_suffix ⇒ Object

Returns the value of attribute table_suffix.



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# File 'lib/fiona7/table_switcher.rb', line 4

def table_suffix
  @table_suffix
end

Instance Method Details

#switch ⇒ Object 



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# File 'lib/fiona7/table_switcher.rb', line 13

def switch
  if klass.table_name != self.table_name 
    value = self.table_name
    klass_name = klass.name
    Rails.logger.debug "Switching table name to #{value} on #{self.klass.name}"
    # TODO: cache values for two modes somehow? (to improve performance)
    # NOTE: we abuse the fact that the two tables have identical schemes
    # and only swap out the table name sneakly, skipping DB schema lookup
    # and also reloading of attributes, which can break the app
    # (by removing primary key accessor :id)
    klass.instance_eval do
      connection.clear_cache!
      @table_name        = value
      @quoted_table_name = nil
      @arel_table        = nil
      @sequence_name     = nil unless defined?(@explicit_sequence_name) && @explicit_sequence_name
      @relation          = ActiveRecord::Relation.create(self, arel_table)

      if self == Fiona7::WriteObj
        # reset associations, otherwise they go out of sync
        has_many :children, :class_name => 'RailsConnector::AbstractObj', :foreign_key => 'parent_obj_id'
        belongs_to :parent, :class_name => 'RailsConnector::AbstractObj', :foreign_key => 'parent_obj_id'
      end
    end
  end
end