Class: LolDba::Migration

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(migration_file) ⇒ Migration

Returns a new instance of Migration.



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 5

def initialize(migration_file)
  @full_name = File.basename(migration_file, '.rb')
  @writer = LolDba::Writer.new("#{@full_name}.sql")
  require Rails.root.join(migration_file)
end

Instance Attribute Details

#full_name ⇒ Object (readonly)

Returns the value of attribute full_name.



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 3

def full_name
  @full_name
end

#writer ⇒ Object (readonly)

Returns the value of attribute writer.



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 3

def writer
  @writer
end

Instance Method Details

#connection ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 41

def connection
  ActiveRecord::Base.connection
end

#down ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 34

def down
  generate_instead_of_executing do
    migration_class.migrate(:down)
    connection.execute("DELETE FROM schema_migrations WHERE version = #{number}")
  end
end

#generate_instead_of_executing ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 45

def generate_instead_of_executing
  migration_mocker = LolDba::MigrationMocker.new(writer)

  migration_mocker.redefine_migration_methods
  yield
  migration_mocker.reset_methods
end

#migration_class ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 23

def migration_class
  name.camelize.split('.')[0].constantize
end

#name ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 15

def name
  /^(\d+)_(.*)$/.match(full_name)[2]
end

#number ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 11

def number
  /^(\d+)_(.*)$/.match(full_name)[1]
end

#to_s ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 19

def to_s
  full_name
end

#up ⇒ Object 



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# File 'lib/lol_dba/sql_migrations/migration.rb', line 27

def up
  generate_instead_of_executing do
    migration_class.migrate(:up)
    connection.execute("INSERT INTO schema_migrations (version) VALUES (#{number})")
  end
end