add: augment relationship type

Author: steve-chavez

sql/pgrst_schema_cache.sql

@@ -1,3 +1,20 @@
+-- Now what we need is a function that gets us from
+-- relationship -> view_key_dependency -> relationship
+
+-- Adds M2O and O2O relationships for views to tables, tables to views, and views to views. The example below is taken from the test fixtures, but the views names/colnames were modified.
+--allM2OandO2ORels sample query result--
+-- private      | personnages          | private    | actors           | personnages_role_id_fkey   | {"(role_id,id)"}
+
+--allViewsKeyDependencies sample query result--
+-- private      | personnages          | test       | personnages_view | personnages_role_id_fkey   | f       | {"(role_id,roleId)"}
+-- private      | actors               | test       | actors_view      | personnages_role_id_fkey   | f_ref   | {"(id,actorId)"}
+
+-- --this function result--
+-- test         | personnages_view     | private    | actors           | personnages_role_id_fkey   | f        | {"(roleId,id)"}       | viewTableM2O
+-- private      | personnages          | test       | actors_view      | personnages_role_id_fkey   | f_ref    | {"(role_id,actorId)"} | tableViewM2O
+-- test         | personnages_view     | test       | actors_view      | personnages_role_id_fkey   | f,r_ref  | {"(roleId,actorId)"}  | viewViewM2O
+
+
 -- we need this type otherwise the all_m2o_and_o2o_rels fails with
 -- ERROR: column "cols_and_fcols" has pseudo-type record[]
 -- This is due to the array_agg(row(...)) which gives a record[], which is a pseudotype
@@ -17,14 +34,16 @@ CREATE TYPE key_dep_type AS enum(
 );
 
 create type relationship as (
-  table_schema         text,
-  table_name           text,
-  foreign_table_schema text,
-  foreign_table_name   text,
-  is_self              bool ,
-  constraint_name      text,
-  cols_and_fcols       ref_pair[],
-  is_one_to_one        bool
+  origin_schema   text,
+  origin_name     text,
+  foreign_schema  text,
+  foreign_name    text,
+  is_self         bool ,
+  constraint_name text,
+  cols_and_fcols  ref_pair[],
+  is_one_to_one   bool,
+  is_origin_view  bool,
+  is_foreign_view bool
 );
 
 -- | A view foreign key or primary key dependency detected on its source table
@@ -72,14 +91,16 @@ pks_uniques_cols as (
   group by oid, conrelid
 )
 select
-  ns1.nspname as table_schema,
-  tab.relname as table_name,
-  ns2.nspname as foreign_table_schema,
-  other.relname as foreign_table_name,
+  ns1.nspname as origin_schema,
+  tab.relname as origin_name,
+  ns2.nspname as foreign_schema,
+  other.relname as foreign_name,
   traint.conrelid = traint.confrelid as is_self,
   traint.conname  as constraint_name,
   column_info.cols_and_fcols,
-  (column_info.cols in (select cols from pks_uniques_cols where conrelid = traint.conrelid)) as one_to_one
+  (column_info.cols in (select cols from pks_uniques_cols where conrelid = traint.conrelid)) as one_to_one,
+  false as is_origin_view,
+  false as is_foreign_view
 from pg_constraint traint
 join lateral (
   select