Work toward #358

-link to 
https://github.com/colouring-london/colouring_london_analysis/blob/master/bulk_extracts/nlud_landuse_classification.sql

migrations/009.landuse.down.sql

@@ -1,17 +0,0 @@
--- Remove planning and controls fields
---Landuse is hierachical. Highest level is Order (Residential) then Group (Residential-Dwelling) then Class (Residential-Dwelling-Detached house)
---Fields could be linked when not mixed use Example: If user inputs class field (Detached-House) on front end then trigger on db automatically will populate group and order. If we go this route then a trigger is needed on the db both to run and remove this process.
---Landuse us a table as #358
--- Land use, single or mutiple classes?
-ALTER TABLE buildings DROP COLUMN IF EXISTS landuse_mutiple_use;
-
--- Land use, how many different uses?
-ALTER TABLE buildings DROP COLUMN IF EXISTS landuse_number_of_uses;
-
-<<<<<<< HEAD
--- Land use is table with 3 levels order > group > class
-DROP TABLE IF EXISTS landuse_classifications;
-=======
---Land use class, group and order will be stored in a new table
-DROP TABLE building_landuse IF EXISTS CASCADE;  
->>>>>>> 68a9fd1b80ddfe8a206ff1d946c7b94ae83d1264

migrations/0xx.landuse.down.sql

@@ -0,0 +1,28 @@
+--Landuse is hierachical. Highest level is Order (ie. Residential) then Group (ie Residential-Dwelling) then Class (ie Residential-Dwelling-Detached house)
+--Interface will collected most detailed (class) but visualise highest level (order)
+--Landuse is a table as #358
+
+-- Land use is table with 3 levels of hierachy (highest to lowest). order > group > class
+DROP TABLE IF EXISTS landuse_classifications;
+
+-- Land use class or classes, array object, client constrained.
+ALTER TABLE buildings DROP COLUMN IF EXISTS current_landuse_class;
+
+-- Land use order, singular. Client and db constrained.
+ALTER TABLE buildings DROP COLUMN IF EXISTS current_landuse_order;
+
+--Land use class, group and order will be stored in a new table
+DROP TABLE building_landuse IF EXISTS CASCADE;
+
+--===========================================
+--
+-- 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.landuse.up.sql

@@ -0,0 +1,30 @@
+--Landuse is hierachical. Highest level is Order (Residential) then Group (Residential-Dwelling) then Class (Residential-Dwelling-Detached house)
+--Interface will collected most detailed (class) but visualise highest level (order)
+--Landuse is a table as #358
+
+-- Land use is table with 3 levels of hierachy (highest to lowest). order > group > class
+
+-- 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 current_landuse_class text ARRAY[250];
+
+-- Land use order, singular. Client and db constrained with foreign key
+--
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS current_landuse_order text,
+ADD CONSTRAINT fk_landuse_order
+FOREIGN KEY ("level")
+REFERENCES bulk_sources.nlud_classification_order_group ("level");
+
+
+
+--===========================================
+--
+-- 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 ADD COLUMN IF NOT EXISTS original_landuse_class text ARRAY[250];
+
+-- Land use order, singular. Client and db constrained.
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS original_landuse_order;