Merge pull request #588 from colouring-london/feature/migrations_type_extend

Migrations to enable the original landuse to be added to site

migrations/016.landuse.down.sql

@@ -13,18 +13,3 @@ ALTER TABLE buildings DROP COLUMN IF EXISTS current_landuse_group;
 
 -- Land use order, singular. Client and db constrained.
 ALTER TABLE buildings DROP COLUMN IF EXISTS current_landuse_order;
-
-
-
---===========================================
---
--- We also collect original landuse, structure & process is as current land use
--- We don't currently collect intermediate historic uses
---
---===========================================
-
--- Original Land use class or classes, array object, client constrained.
-ALTER TABLE buildings DROP COLUMN IF EXISTS original_landuse_class;
-
--- Land use order, singular. Client and db constrained.
-ALTER TABLE buildings DROP COLUMN IF EXISTS original_landuse_order;

migrations/0xx.type-extend.down.sql

@@ -0,0 +1,16 @@
+-- Building original use, collecting both class and order
+ALTER TABLE buildings DROP COLUMN IF EXISTS original_landuse_class;
+
+-- [Disabled for launch] Date of change of use
+-- This needs to pair with demolition
+ALTER TABLE buildings DROP COLUMN IF EXISTS date_change_building_use;
+
+
+-- Original Land use class or classes, array object, client constrained.
+ALTER TABLE buildings DROP COLUMN IF EXISTS original_landuse_class;
+
+-- Land use order, singular. Client and db constrained.
+ALTER TABLE buildings DROP COLUMN IF EXISTS original_landuse_order;
+
+-- Land use order, singular. Client and db constrained.
+ALTER TABLE buildings DROP COLUMN IF EXISTS original_landuse_source;

migrations/0xx.type-extend.up.sql

@@ -0,0 +1,14 @@
+-- Land use order, singular. Client and db constrained with foreign key
+ALTER TABLE buildings
+  ADD COLUMN IF NOT EXISTS original_landuse_order text,
+  ADD FOREIGN KEY (current_landuse_order)
+  REFERENCES reference_tables.buildings_landuse_order (description);
+
+-- Land use groups, array. Derived from classes.
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS original_landuse_group text ARRAY[41];
+
+ -- Land use class or classes, array object, client constrained. ARRAY[] is used to constrain array size. The array is limited to 250 based on Westfield Stratford as a single toid with many uses, this may want to be reduced down to reduce maximum size.
+
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS original_landuse_class text ARRAY[250];
+
+--Landuse source