How can I fix "operator does not exist: text = uuid" when using Haskell's postgres-simple library to perform a multi-row insert? - sql

Question

I am using the postgres-simple library to insert into the eligible_class_passes table. Which is essentially a join table representing a many to many relationship.
I am using the executeMany function from the postgres-simple to do a multi row insert.
updateEligibleClassPasses :: Connection -> Text -> Text -> [Text] -> IO Int64
updateEligibleClassPasses conn tenantId classTypeId classPassTypeIds =
withTransaction conn $ do
executeMany
simpleConn
[sql|
INSERT INTO eligible_class_passes (class_type_id, class_pass_type_id)
SELECT upd.class_type_id::uuid, upd.class_pass_type_id::uuid
FROM (VALUES (?, ?, ?)) as upd(class_type_id, class_pass_type_id, tenant_id)
INNER JOIN class_types AS ct
ON upd.class_type_id::uuid = ct.id
INNER JOIN subscription_types AS st
ON class_pass_type_id::uuid = st.id
WHERE ct.tenant_id = upd.tenant_id::uuid AND st.tenant_id = upd.tenant_id::uuid
|]
params
where
addParams classPassTypeId = (classTypeId, classPassTypeId, tenantId)
params = addParams <$> classPassTypeIds
When this function is executed with the correct parameters applied I get the following runtime error
SqlError {sqlState = "42883", sqlExecStatus = FatalError, sqlErrorMsg = "operator does not exist: text = uuid", sqlErrorDetail = "", sqlErrorHint = "No operator matches the given name and argument type(s). You might need to add explicit type casts."}
However, when translated to SQL without the parameter substitutions (?) the query works correctly when executed in psql.
INSERT INTO eligible_class_passes (class_type_id, class_pass_type_id)
SELECT upd.class_type_id::uuid, upd.class_pass_type_id::uuid
FROM (VALUES ('863cb5ea-7a68-41d5-ab9f-5344605de500', 'e9195660-fd48-4fa2-9847-65a0ad323bd5', '597e6d7a-092a-49be-a2ea-11e8d85d8f82')) as upd(class_type_id, class_pass_type_id, tenant_id)
INNER JOIN class_types AS ct
ON upd.class_type_id::uuid = ct.id
INNER JOIN subscription_types AS st
ON class_pass_type_id::uuid = st.id
WHERE ct.tenant_id = upd.tenant_id::uuid AND st.tenant_id = upd.tenant_id::uuid;
My schema is as follows
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
CREATE TABLE tenants (
id UUID NOT NULL DEFAULT uuid_generate_v4() PRIMARY KEY,
name text NOT NULL UNIQUE,
email text NOT NULL UNIQUE,
created_at timestamp with time zone NOT NULL default now(),
updated_at timestamp with time zone NOT NULL default now()
);
CREATE TABLE class_types (
id UUID NOT NULL DEFAULT uuid_generate_v4() PRIMARY KEY,
FOREIGN KEY (tenant_id) REFERENCES tenants (id),
created_at timestamp with time zone NOT NULL default now(),
updated_at timestamp with time zone NOT NULL default now()
);
CREATE TABLE class_pass_types (
id UUID NOT NULL DEFAULT uuid_generate_v4() PRIMARY KEY,
name TEXT NOT NULL,
tenant_id UUID NOT NULL,
price Int NOT NULL,
created_at timestamp with time zone NOT NULL default now(),
updated_at timestamp with time zone NOT NULL default now(),
FOREIGN KEY (tenant_id) REFERENCES tenants (id)
);
-- Many to many join through table.
-- Expresses class pass type redeemability against class types.
CREATE TABLE eligible_class_passes (
class_type_id UUID,
class_pass_type_id UUID,
created_at timestamp with time zone NOT NULL default now(),
updated_at timestamp with time zone NOT NULL default now(),
FOREIGN KEY (class_type_id) REFERENCES class_types (id) ON DELETE CASCADE,
FOREIGN KEY (class_pass_type_id) REFERENCES class_pass_types (id) ON DELETE CASCADE,
PRIMARY KEY (
class_type_id, class_pass_type_id
)
);

Answer 1

To help debug your issue, use formatQuery function, then you can see what kind of final query postgresql-simple is sending to the server.
Also, I'd recommend using UUID type from uuid-types package, instead of Text for the uuids. Using Text most likely hides some issues from you (which you'll hopefully see by using formatQuery.