62 lines
2.2 KiB
PL/PgSQL
62 lines
2.2 KiB
PL/PgSQL
begin;
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-- We are adding the name to the base host catalog type. This allows the db
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-- to ensure that catalog names are unique in a scope across all subtypes.
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alter table host_catalog
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add column name wt_name;
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alter table host_catalog
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add constraint host_catalog_scope_id_name_uq
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unique (scope_id, name);
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-- Now that we've added the name column to the base type, we copy
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-- the name from the static host catalog table into the base table.
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update host_catalog
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set name = st.name
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from
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static_host_catalog st
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where
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host_catalog.public_id = st.public_id and
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st.name is not null;
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-- Replace the insert_host_catalog_subtype function defined in 0/20_host.up.sql
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-- to include the name.
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-- insert_host_catalog_subtype() is a before insert trigger
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-- function for subtypes of host_catalog
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create or replace function insert_host_catalog_subtype()
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returns trigger
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as $$
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begin
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insert into host_catalog
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(public_id, scope_id, name)
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values
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(new.public_id, new.scope_id, new.name);
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return new;
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end;
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$$ language plpgsql;
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comment on function insert_host_catalog_subtype() is
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'insert_host_catalog_subtype() inserts sub type name into the base type host catalog table';
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-- Now that we are tracking the name, which is mutable, we need to also
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-- update the base table when the subtype tables are updated.
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-- update_host_catalog_subtype() is intended to be used as a before update
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-- trigger for all host catalog sub types. The purpose is to ensure that the
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-- base table for host catalog to contain the updated names for each host catalog
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-- in order to enforce uniqueness across all host catalogs, regardless of subtype,
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-- in a given scope.
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create function update_host_catalog_subtype()
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returns trigger
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as $$
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begin
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update host_catalog set name = new.name where public_id = new.public_id and new.name != name;
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return new;
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end;
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$$ language plpgsql;
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comment on function update_host_catalog_subtype() is
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'update_host_catalog_subtype() will update base host catalog type name column with new values from sub type';
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create trigger update_host_catalog_subtype before update on static_host_catalog
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for each row execute procedure update_host_catalog_subtype();
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commit;
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