#41 Updated ERD; added and tested migrations.

resources/migrations/20170721084900-dwellings.down.sql

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+--------------------------------------------------------------------------------
+----
+---- 20170721084900.up.sql: add dwellings table, to deal with flatted addresses.
+----
+---- This program is free software; you can redistribute it and/or
+---- modify it under the terms of the GNU General Public License
+---- as published by the Free Software Foundation; either version 2
+---- of the License, or (at your option) any later version.
+----
+---- This program is distributed in the hope that it will be useful,
+---- but WITHOUT ANY WARRANTY; without even the implied warranty of
+---- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+---- GNU General Public License for more details.
+----
+---- You should have received a copy of the GNU General Public License
+---- along with this program; if not, write to the Free Software
+---- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+---- USA.
+----
+---- Copyright (C) 2017 Simon Brooke for Radical Independence Campaign
+----
+--------------------------------------------------------------------------------
+----
+---- NOTE
+---- This file is essentially a Postgres schema dump of a database schema which was
+---- created with the function initdb! in the file src/clj/youyesyet/db/schema.clj.
+---- This file has then been mildly massaged to work with Migratus.
+---- Either this file or src/clj/youyesyet/db/schema.clj is redundant; schema.clj
+---- represents the older, Korma, way of doing things but does not readily allow
+---- for migrations; this file represents the newer Migratus/HugSQL way. I'm not
+---- certain which of these paths I'm going to go down.
+----
+--------------------------------------------------------------------------------
+
+alter table canvassers add column address_id integer references addresses(id);
+--;;
+alter table electors add column address_id integer references addresses(id);
+--;;
+alter table visits add column address_id integer references addresses(id);
+--;;
+
+update canvassers set address_id =
+  (select address_id from dwellings where id = canvassers.dwelling_id);
+--;;
+
+update electors set address_id =
+  (select address_id from dwellings where id = electors.dwelling_id);
+--;;
+
+update visits set address_id =
+  (select address_id from dwellings where id = visits.dwelling_id);
+--;;
+
+alter table canvassers alter column address_id set not null;
+--;;
+alter table electors alter column address_id set not null;
+--;;
+alter table visits alter column address_id set not null;
+--;;
+
+alter table canvassers drop column dwelling_id;
+--;;
+alter table electors drop column dwelling_id;
+--;;
+alter table visits drop column dwelling_id;
+--;;
+
+drop table if exists dwellings;
+--;;

resources/migrations/20170721084900-dwellings.up.sql

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+--------------------------------------------------------------------------------
+----
+---- 20170721084900.up.sql: add dwellings table, to deal with flatted addresses.
+----
+---- This program is free software; you can redistribute it and/or
+---- modify it under the terms of the GNU General Public License
+---- as published by the Free Software Foundation; either version 2
+---- of the License, or (at your option) any later version.
+----
+---- This program is distributed in the hope that it will be useful,
+---- but WITHOUT ANY WARRANTY; without even the implied warranty of
+---- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+---- GNU General Public License for more details.
+----
+---- You should have received a copy of the GNU General Public License
+---- along with this program; if not, write to the Free Software
+---- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+---- USA.
+----
+---- Copyright (C) 2017 Simon Brooke for Radical Independence Campaign
+----
+--------------------------------------------------------------------------------
+----
+---- NOTE
+---- This file is essentially a Postgres schema dump of a database schema which was
+---- created with the function initdb! in the file src/clj/youyesyet/db/schema.clj.
+---- This file has then been mildly massaged to work with Migratus.
+---- Either this file or src/clj/youyesyet/db/schema.clj is redundant; schema.clj
+---- represents the older, Korma, way of doing things but does not readily allow
+---- for migrations; this file represents the newer Migratus/HugSQL way. I'm not
+---- certain which of these paths I'm going to go down.
+----
+--------------------------------------------------------------------------------
+
+CREATE TABLE IF NOT EXISTS dwellings (
+    id serial NOT NULL primary key,
+    address_id integer NOT NULL,
+    sub_address varchar(16)
+);
+--;;
+
+ALTER TABLE public.dwellings OWNER TO youyesyet;
+--;;
+
+INSERT INTO dwellings (address_id, sub_address)
+  SELECT DISTINCT id, '' FROM addresses;
+--;;
+
+alter table canvassers add column dwelling_id integer references dwellings(id);
+--;;
+alter table electors add column dwelling_id integer references dwellings(id);
+--;;
+alter table visits add column dwelling_id integer references dwellings(id);
+--;;
+
+update canvassers set dwelling_id =
+  (select id from dwellings where address_id = canvassers.address_id);
+--;;
+
+update electors set dwelling_id =
+  (select id from dwellings where address_id = electors.address_id);
+--;;
+
+update visits set dwelling_id =
+  (select id from dwellings where address_id = visits.address_id);
+--;;
+
+alter table canvassers alter column dwelling_id set not null;
+--;;
+alter table electors alter column dwelling_id set not null;
+--;;
+alter table visits alter column dwelling_id set not null;
+--;;
+
+alter table canvassers drop constraint canvassers_address_id_fkey;
+--;;
+alter table electors drop constraint electors_address_id_fkey;
+--;;
+alter table visits drop constraint visits_address_id_fkey;
+--;;
+
+alter table canvassers drop column address_id;
+--;;
+alter table electors drop column address_id;
+--;;
+alter table visits drop column address_id;
+--;;