推断的类型参数[Boolean]不符合方法过滤器的类型参数范围[T <：slick.lifted.Rep [_]]

Question

I got compile error on the following for the type Boolean, but it works fine for other data types. Any ideas? Please advise. Thanks

inferred type arguments [Boolean] do not conform to method filter's type parameter bounds [T <: slick.lifted.Rep[_]]
[error]     db.run(repo.filter(_.id == id).map(r => (r.id, r.name, r.isPublic)).update((id, name, isPublic)))
[error]  type mismatch;
[error]  found   : proj.domain.mapping.RepositoryMapping => Boolean
[error]  required: proj.domain.mapping.RepositoryMapping => T
[error]     db.run(repo.filter(_.id == id).map(r => (r.id, r.name, r.isPublic)).update((id, name, isPublic)))
[error]                             ^
[error] two errors found
[error] (compile:compileIncremental) Compilation failed

Here's the code:

def updateTest(id: Long, name: String, isPublic: Boolean): Unit = {
    db.run(repo.filter(_.id == id).map(r => (r.id, r.name, r.isPublic)).update((id, name, isPublic)))
  }

Answer 1

If you look at the QUERIES documentation you might find the following warning

Most operators mimic the plain Scala equivalents, but you have to use === instead of == for comparing two values for equality and =!= instead of != for inequality. This is necessary because these operators are already defined (with unsuitable types and semantics) on the base type Any, so they cannot be replaced by extension methods.

So change your code to use === as following:

def updateTest(id: Long, name: String, isPublic: Boolean): Unit = {
    db.run(repo.filter(_.id === id).map(r => (r.id, r.name, r.isPublic)).update((id, name, isPublic)))
}