Fixed bug with SERIAL not primary key

Set a trigger to protect cartodb_id to be updated

app/models/table.rb

@@ -54,12 +54,16 @@ class Table < Sequel::Model(:user_tables)
                 column.gsub(/primary\s+key/i,"UNIQUE")
               end
             end
-            sanitized_force_schema.unshift("cartodb_id SERIAL") if import_from_file.blank?
+            # If import_from_file is blank primary key is added now.
+            # If not we add it after importing the CSV file, becaus the number of columns
+            # will not match
+            sanitized_force_schema.unshift("cartodb_id SERIAL PRIMARY KEY") if import_from_file.blank?
             user_database.run("CREATE TABLE #{self.name} (#{sanitized_force_schema.join(', ')})")
           end
         end
       end
       import_data! unless import_from_file.nil?
+      set_triggers
     end
     super
   end
@@ -345,4 +349,25 @@ class Table < Sequel::Model(:user_tables)
     self.force_schema = result.join(', ')
   end
 
+  def set_triggers
+    owner.in_database(:as => :superuser) do |user_database|
+      user_database.run(<<-TRIGGER
+        -- Sets trigger to protect primary key cartodb_id to be updated
+        DROP TRIGGER IF EXISTS protect_data_trigger ON #{self.name};
+
+        CREATE OR REPLACE FUNCTION protect_data() RETURNS TRIGGER AS $protect_data_trigger$
+          BEGIN
+               NEW.cartodb_id := OLD.cartodb_id;
+               RETURN NEW;
+          END;
+        $protect_data_trigger$ LANGUAGE plpgsql;
+
+        CREATE TRIGGER protect_data_trigger
+        BEFORE UPDATE ON #{self.name}
+            FOR EACH ROW EXECUTE PROCEDURE protect_data();
+TRIGGER
+      )
+    end
+  end
+
 end

spec/acceptance/api/tables_spec.rb

@@ -249,6 +249,12 @@ feature "Tables JSON API" do
     table.reload
     row = table.to_json(:rows_per_page => 1, :page => 0)[:rows].first
     row[:description].should == "Description 123"
+
+    put_json "/api/json/tables/#{table.id}/rows/#{row[:cartodb_id]}", {:cartodb_id => "666"}
+    response.status.should == 200
+    table.reload
+    row = table.to_json(:rows_per_page => 1, :page => 0)[:rows].first
+    row[:cartodb_id].should == 1
   end
 
   scenario "Update the value from a ceil with an invalid value" do

spec/models/user_spec.rb

@@ -138,4 +138,21 @@ describe User do
     api_key.api_key.should == key
   end
 
+  it "should not be able to update primary key value" do
+    user = create_user
+    table = new_table
+    table.user_id = user.id
+    table.name = 'antantaric species'
+    table.import_from_file = Rack::Test::UploadedFile.new("#{Rails.root}/db/fake_data/import_csv_1.csv", "text/csv")
+    table.save
+
+    query_result = user.run_query("select * from antantaric_species order by cartodb_id asc limit 1")
+    query_result[:rows][0][:cartodb_id].should == 1
+
+    user.run_query("update antantaric_species set cartodb_id = 666 where cartodb_id = 1")
+
+    query_result = user.run_query("select * from antantaric_species order by cartodb_id asc limit 1")
+    query_result[:rows][0][:cartodb_id].should == 1
+  end
+
 end