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require 'abstract_unit'
class CopyTableTest < Test::Unit::TestCase
fixtures :companies, :comments
def setup
@connection = ActiveRecord::Base.connection
class << @connection
public :copy_table, :table_structure, :indexes
end
end
def test_copy_table(from = 'companies', to = 'companies2', options = {})
assert_nothing_raised {copy_table(from, to, options)}
assert_equal row_count(from), row_count(to)
if block_given?
yield from, to, options
else
assert_equal column_names(from), column_names(to)
end
@connection.drop_table(to) rescue nil
end
def test_copy_table_renaming_column
test_copy_table('companies', 'companies2',
:rename => {'client_of' => 'fan_of'}) do |from, to, options|
expected = column_values(from, 'client_of')
assert expected.any?, 'only nils in resultset; real values are needed'
assert_equal expected, column_values(to, 'fan_of')
end
end
def test_copy_table_with_index
test_copy_table('comments', 'comments_with_index') do
@connection.add_index('comments_with_index', ['post_id', 'type'])
test_copy_table('comments_with_index', 'comments_with_index2') do
assert_equal table_indexes_without_name('comments_with_index'),
table_indexes_without_name('comments_with_index2')
end
end
end
protected
def copy_table(from, to, options = {})
@connection.copy_table(from, to, {:temporary => true}.merge(options))
end
def column_names(table)
@connection.table_structure(table).map {|column| column['name']}
end
def column_values(table, column)
@connection.select_all("SELECT #{column} FROM #{table} ORDER BY id").map {|row| row[column]}
end
def table_indexes_without_name(table)
@connection.indexes('comments_with_index').delete(:name)
end
def row_count(table)
@connection.select_one("SELECT COUNT(*) AS count FROM #{table}")['count']
end
end
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