Top Level Namespace

Defined Under Namespace

Modules: ActiveRecord, DB2, Test Classes: Fixture, Fixtures, Mysql

Constant Summary collapse

MysqlRes =

for compatibility

Mysql::Result
MysqlField = 
Mysql::Field
MysqlError = 
Mysql::Error

Instance Method Summary collapse

Instance Method Details

#require_library_or_gem(library_name) ⇒ Object

Method that requires a library, ensuring that rubygems is loaded This is used in the database adaptors to require DB drivers. Reasons: (1) database drivers are the only third-party library that Rails depend upon (2) they are often installed as gems



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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 8

def require_library_or_gem(library_name)
  begin
    require library_name
  rescue LoadError => cannot_require
    # 1. Requiring the module is unsuccessful, maybe it's a gem and nobody required rubygems yet. Try.
    begin
      require 'rubygems'
    rescue LoadError => rubygems_not_installed
      raise cannot_require
    end
    # 2. Rubygems is installed and loaded. Try to load the library again
    begin
      require library_name
    rescue LoadError => gem_not_installed
      raise cannot_require
    end
  end
end