Class: Lhm::Migration

Inherits:
Object
  • Object
show all
Defined in:
lib/lhm/migration.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(origin, destination, conditions = nil, renames = {}, time = Time.now) ⇒ Migration

Returns a new instance of Migration.



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# File 'lib/lhm/migration.rb', line 11

def initialize(origin, destination, conditions = nil, renames = {}, time = Time.now)
  @origin = origin
  @destination = destination
  @conditions = conditions
  @renames = renames
  @table_name = TableName.new(@origin.name, time)
end

Instance Attribute Details

#destination ⇒ Object (readonly)

Returns the value of attribute destination.



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# File 'lib/lhm/migration.rb', line 9

def destination
  @destination
end

#origin ⇒ Object (readonly)

Returns the value of attribute origin.



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# File 'lib/lhm/migration.rb', line 9

def origin
  @origin
end

#renames ⇒ Object (readonly)

Returns the value of attribute renames.



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# File 'lib/lhm/migration.rb', line 9

def renames
  @renames
end

Instance Method Details

#archive_name ⇒ Object 



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# File 'lib/lhm/migration.rb', line 27

def archive_name
  @archive_name ||= @table_name.archived
end

#conditions ⇒ Object 



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# File 'lib/lhm/migration.rb', line 19

def conditions
  if @conditions.kind_of?(Proc)
    @conditions.call
  else
    @conditions
  end
end

#destination_columns ⇒ Object 



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# File 'lib/lhm/migration.rb', line 47

def destination_columns
  @destination_columns ||= intersection.destination.joined
end

#destination_name ⇒ Object 



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# File 'lib/lhm/migration.rb', line 43

def destination_name
  @destination_name ||= destination.name
end

#intersection ⇒ Object 



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# File 'lib/lhm/migration.rb', line 31

def intersection
  Intersection.new(@origin, @destination, @renames)
end

#origin_columns ⇒ Object 



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# File 'lib/lhm/migration.rb', line 39

def origin_columns
  @origin_columns ||= intersection.origin.typed(origin_name)
end

#origin_name ⇒ Object 



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# File 'lib/lhm/migration.rb', line 35

def origin_name
  @table_name.original
end