Class: Dumbo::PgObject

Inherits:
Object
  • Object
show all
Defined in:
lib/dumbo/pg_object.rb

Direct Known Subclasses

Aggregate, Cast, Function, Operator, Type

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(oid) ⇒ PgObject

Returns a new instance of PgObject.



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# File 'lib/dumbo/pg_object.rb', line 14

def initialize(oid)
  @oid = oid
  load_attributes
end

Instance Attribute Details

#oid ⇒ Object (readonly)

Returns the value of attribute oid.



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# File 'lib/dumbo/pg_object.rb', line 5

def oid
  @oid
end

Class Method Details

.identfied_by(*args) ⇒ Object 



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# File 'lib/dumbo/pg_object.rb', line 9

def identfied_by(*args)
  self.identifier = args
end

Instance Method Details

#downgrade(other) ⇒ Object 



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# File 'lib/dumbo/pg_object.rb', line 57

def downgrade(other)
  return drop if other.nil?

  if other.identify != identify
    fail 'Not the Same Objects!'
  end

  if other.to_sql != to_sql
    <<-SQL.gsub(/^ {8}/, '')
    #{drop}
    #{other.to_sql}
    SQL
  end
end

#execute(sql) ⇒ Object 



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# File 'lib/dumbo/pg_object.rb', line 72

def execute(sql)
  ActiveRecord::Base.connection.execute(sql)
end

#get(type = nil) ⇒ Object 



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# File 'lib/dumbo/pg_object.rb', line 23

def get(type = nil)
  case type
  when 'function', 'pg_proc'
    Function.new(oid).get
  when 'cast', 'pg_cast'
    Cast.new(oid).get
  when 'operator', 'pg_operator'
    Operator.new(oid).get
  when 'type', 'pg_type'
    Type.new(oid).get
  else
    load_attributes
    self
  end
end

#identify ⇒ Object 



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# File 'lib/dumbo/pg_object.rb', line 19

def identify
  identifier.map { |a| public_send a }
end

#load_attributes ⇒ Object 



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# File 'lib/dumbo/pg_object.rb', line 39

def load_attributes
end

#upgrade(other) ⇒ Object 



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# File 'lib/dumbo/pg_object.rb', line 42

def upgrade(other)
  return to_sql if other.nil?

  if other.identify != identify
    fail 'Not the Same Objects!'
  end

  if other.to_sql != to_sql
    <<-SQL.gsub(/^ {8}/, '')
    #{drop}
    #{to_sql}
    SQL
  end
end