Added migration support for SQLite (using temporary tables to simulate ALTER TABLE) #1771 [Sam Stephenson]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1893 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 64 insertions, 0 deletions

diff --git a/activerecord/test/copy_table_sqlite.rb b/activerecord/test/copy_table_sqlite.rb
new file mode 100644
index 0000000000..f3f5f1ce46
--- /dev/null
+++ b/activerecord/test/copy_table_sqlite.rb
@@ -0,0 +1,64 @@
+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|
+      assert_equal column_values(from, 'client_of').compact.sort, 
+                   column_values(to, 'fan_of').compact.sort
+    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}").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