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https://github.com/hasura/graphql-engine.git
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fc7ea9213c
Insert trigger function: If query affects no rows then return `null` Insert trigger function is modified to have `IF r IS NULL THEN RETURN null; ELSE RETURN r; END IF;` in return statement.
35 lines
1.7 KiB
Django/Jinja
35 lines
1.7 KiB
Django/Jinja
CREATE OR REPLACE FUNCTION {{function_name}}() RETURNS trigger LANGUAGE plpgsql AS $$
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DECLARE r {{table_name}}%ROWTYPE;
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DECLARE conflict_clause jsonb;
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DECLARE action text;
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DECLARE constraint_name text;
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DECLARE set_expression text;
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BEGIN
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conflict_clause = current_setting('hasura.conflict_clause')::jsonb;
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IF ({{check_expression}}) THEN
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CASE
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WHEN conflict_clause = 'null'::jsonb THEN INSERT INTO {{table_name}} VALUES (NEW.*) RETURNING * INTO r;
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ELSE
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action = conflict_clause ->> 'action';
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constraint_name = quote_ident(conflict_clause ->> 'constraint');
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set_expression = conflict_clause ->> 'set_expression';
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IF action is NOT NULL THEN
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CASE
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WHEN action = 'ignore'::text AND constraint_name IS NULL THEN
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INSERT INTO {{table_name}} VALUES (NEW.*) ON CONFLICT DO NOTHING RETURNING * INTO r;
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WHEN action = 'ignore'::text AND constraint_name is NOT NULL THEN
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EXECUTE 'INSERT INTO {{table_name}} VALUES ($1.*) ON CONFLICT ON CONSTRAINT ' || constraint_name ||
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' DO NOTHING RETURNING *' INTO r USING NEW;
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ELSE
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EXECUTE 'INSERT INTO {{table_name}} VALUES ($1.*) ON CONFLICT ON CONSTRAINT ' || constraint_name ||
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' DO UPDATE ' || set_expression || ' RETURNING *' INTO r USING NEW;
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END CASE;
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ELSE
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RAISE internal_error using message = 'action is not found'; RETURN NULL;
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END IF;
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END CASE;
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IF r IS NULL THEN RETURN null; ELSE RETURN r; END IF;
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ELSE RAISE check_violation using message = 'insert check constraint failed'; RETURN NULL;
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END IF;
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END $$;
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