Postgres Insert a rule with a return clause into the view.

Question

I'm trying to resolve insert statements with a return clause in a Postgres v9.4 view, but I'm afraid of the syntax. This is how I want to call the insert statement:

CREATE VIEW MyView AS SELECT a.*, b.someCol1
    FROM tableA a JOIN tableB b USING(aPrimaryKey);
INSERT INTO MyView (time, someCol) VALUES (someTime, someValue) RETURNING *;
INSERT INTO MyView (someCol) VALUES (someValue) RETURNING *;

Note that the default value for time is NOW (). This is what I have so far:

CREATE RULE MyRuleName AS ON INSERT TO MyView DO INSTEAD (
    INSERT INTO tableA (time) VALUES COALESCE(NEW.time, NOW());
    INSERT INTO tableB (aPrimaryKey, someCol)
        VALUES (CURRVAL('tableA_aPrimaryKey_seq'), NEW.someValue);
);

The above works to insert a value, but I'm struggling to figure out how to add a return statement. I tried the following without success:

CREATE RULE MyRuleName AS ON INSERT TO MyView DO INSTEAD (
    INSERT INTO tableA (time) VALUES COALESCE(NEW.time, NOW())
        RETURNING *, NEW.someValue;
    INSERT INTO tableB (aPrimaryKey, someCol)
        VALUES (CURRVAL('tableA_aPrimaryKey_seq'), NEW.someValue);
);
-- ERROR:  invalid reference to FROM-clause entry for table "new"

CREATE RULE MyRuleName AS ON INSERT TO MyView DO INSTEAD (
    WITH a AS (INSERT INTO tableA (time)
        VALUES COALESCE(NEW.time, NOW()) RETURNING *)
    INSERT INTO tableB (aPrimaryKey, someCol)
        SELECT aPrimaryKey, NEW.someValue FROM a RETURNING *;
);
-- ERROR:  cannot refer to NEW within WITH query

Argh! Does anyone know a way to add a return statement that gets the primary key (SERIAL) and the time (TIMESTAMP WITH TIME ZONE) added to the database in the first insert along with someCol in the second insert? Thank!

Answer 1

INSTEAD OF INSERT :

CREATE FUNCTION MyFuncName() RETURNS trigger AS $$
DECLARE
  id integer;
BEGIN
  INSERT INTO tableA (time) VALUES COALESCE(NEW.time, NOW()) RETURNING aPrimaryKey INTO id;
  INSERT INTO tableB (aPrimaryKey, someCol1) VALUES (id, NEW.someValue);
  RETURN NEW;
END; $$ LANGUAGE PLPGSQL;

CREATE TRIGGER MyView_on_insert INSTEAD OF INSERT ON MyView
  FOR EACH ROW EXECUTE PROCEDURE MyFuncName();

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RETURNING, , . INTO , . RETURNING, .