What is causing this sqlite foreign key mismatch? - sqlite

Question

I already checked out this question, and thought I had the answer - but then it didn't look right to me.
I have the following pared down example:
CREATE TABLE pipelines (
name VARCHAR NOT NULL,
owner VARCHAR NOT NULL,
description VARCHAR,
PRIMARY KEY (name, owner),
FOREIGN KEY(owner) REFERENCES user (id)
);
CREATE TABLE tasks (
id INTEGER NOT NULL,
title VARCHAR,
pipeline VARCHAR,
owner VARCHAR,
PRIMARY KEY (id),
FOREIGN KEY(pipeline) REFERENCES pipelines (name),
FOREIGN KEY(owner) REFERENCES pipelines (owner)
);
CREATE TABLE user (
id VARCHAR NOT NULL,
name VARCHAR,
password VARCHAR,
PRIMARY KEY (id)
);
pragma foreign_keys=on;
insert into user values ('wayne', '', '');
insert into pipelines values ('pipey', 'wayne', '');
insert into tasks values (1, 'hello', 'pipey', 'wayne');
When executing this code, it bails out:
$ sqlite3 foo.sq3 '.read mismatch.sql'
Error: near line 27: foreign key mismatch
Through the list in the question I cited:
the parent table (user) exists.
the parent columns (name, owner) exist
the parent columns are, in fact, the primary key (I thought that may have been it originally)
the child table references all of the primary key columns in the parent table
So what in the world could be causing this error?

Answer 1

The documentation says:
Usually, the parent key of a foreign key constraint is the primary key of the parent table. If they are not the primary key, then the parent key columns must be collectively subject to a UNIQUE constraint or have a UNIQUE index.
In the pipelines table, neither the name nor the owner columns are, by themselves, unique.
I guess you actually want to have a two-column foreign key in the tasks table:
FOREIGN KEY(pipeline, owner) REFERENCES pipelines(name, owner)