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module ArJdbc
# Defines an AR-JDBC extension. An extension consists of a
# declaration using this method and an ArJdbc::XYZ module that
# contains implementation and overrides for methods in
# ActiveRecord::ConnectionAdapters::AbstractAdapter. When you
# declare your extension, you provide a block that detects when a
# database configured to use the extension is present and loads the
# necessary code for it. AR-JDBC will patch the code into the base
# ActiveRecord::ConnectionAdapters::JdbcAdapter by extending an
# instance of it with your extension module.
#
# +name+ should be a symbol that is the name of a module to be
# defined under the +ArJdbc+ module.
#
# +block+ should be a one- or two-arity block that receives the
# dialect name or driver class name as the first argument, and
# optionally the whole database configuration hash as a second
# argument.
#
# Example:
#
# ArJdbc.extension :Frob do |name|
# if name =~ /frob/i
# # arjdbc/frob.rb should contain the implementation
# require 'arjdbc/frob'
# true
# end
# end
def self.extension(name,&block)
if const_defined?(name)
mod = const_get(name)
else
mod = const_set(name, Module.new)
end
(class << mod; self; end).instance_eval do
unless respond_to?(:adapter_matcher)
define_method :adapter_matcher do |name, config|
if block.arity == 1
block.call(name) ? mod : false
else
block.call(name, config) ? mod : false
end
end
end
end
end
end
Version data entries
27 entries across 27 versions & 7 rubygems