Merge 12304:14009 from trunk.

[rails.git] / db / migrate / 023_add_changesets.rb

diff --git a/db/migrate/023_add_changesets.rb b/db/migrate/023_add_changesets.rb
new file mode 100644 (file)
index 0000000..e0cf390
--- /dev/null
+++ b/db/migrate/023_add_changesets.rb
@@ -0,0 +1,46 @@
+class AddChangesets < ActiveRecord::Migration
+  @@conv_user_tables = ['current_nodes',
+  'current_relations', 'current_ways', 'nodes', 'relations', 'ways' ]
+  
+  def self.up
+    create_table "changesets", innodb_table do |t|
+      t.column "id",             :bigint_pk,              :null => false
+      t.column "user_id",        :bigint,   :limit => 20, :null => false
+      t.column "created_at",     :datetime,               :null => false
+      t.column "open",           :boolean,                :null => false, :default => true
+      t.column "min_lat",        :integer,                :null => true
+      t.column "max_lat",        :integer,                :null => true
+      t.column "min_lon",        :integer,                :null => true
+      t.column "max_lon",        :integer,                :null => true
+    end
+
+    create_table "changeset_tags", innodb_table do |t|
+      t.column "id", :bigint, :limit => 64, :null => false
+      t.column "k",  :string, :default => "", :null => false
+      t.column "v",  :string, :default => "", :null => false
+    end
+
+    add_index "changeset_tags", ["id"], :name => "changeset_tags_id_idx"
+    
+    #
+    # Initially we will have one changeset for every user containing 
+    # all edits up to the API change,  
+    # all the changesets will have the id of the user that made them.
+    # We need to generate a changeset for each user in the database
+    execute "INSERT INTO changesets (id, user_id, created_at, open)" + 
+      "SELECT id, id, creation_time, false from users;"
+
+    @@conv_user_tables.each { |tbl|
+      rename_column tbl, :user_id, :changeset_id
+      #foreign keys too
+      add_foreign_key tbl, [:changeset_id], :changesets, [:id]
+    }
+  end
+
+  def self.down
+    # It's not easy to generate the user ids from the changesets
+    raise IrreversibleMigration.new
+    #drop_table "changesets"
+    #drop_table "changeset_tags"
+  end
+end