fix(views): ORM-454 fix panic when specifying view as either end of a…

… m2m relation (#5137)

Prisma does not currently support creating views. So it also cannot create relationships to them. But it should not blow up with an engine panic in this case.

Fixes prisma/prisma#19249.

psl/parser-database/src/walkers/relation/implicit_many_to_many.rs

@@ -73,6 +73,11 @@ impl<'db> ImplicitManyToManyRelationWalker<'db> {
     pub fn table_name(self) -> ImplicitManyToManyRelationTableName<'db> {
         ImplicitManyToManyRelationTableName(self.relation_name())
     }
+
+    /// The relation starts or ends to a view.
+    pub fn one_side_is_view(self) -> bool {
+        self.model_a().ast_model().is_view() || self.model_b().ast_model().is_view()
+    }
 }
 
 /// A table name for an implicit relation's join table. Useful for its Display impl.

schema-engine/connectors/sql-schema-connector/src/sql_schema_calculator.rs

@@ -185,7 +185,8 @@ fn push_relation_tables(ctx: &mut Context<'_>) {
     let m2m_relations = datamodel
         .db
         .walk_relations()
-        .filter_map(|relation| relation.refine().as_many_to_many());
+        .filter_map(|relation| relation.refine().as_many_to_many())
+        .filter(|m2m| !m2m.one_side_is_view());
 
     for m2m in m2m_relations {
         let table_name = m2m.table_name().to_string();

schema-engine/sql-migration-tests/tests/migrations/views.rs

@@ -18,3 +18,30 @@ fn nothing_gets_written_in_migrations(api: TestApi) {
     let expected_sql = expect!["-- This is an empty migration."];
     api.expect_sql_for_schema(dm, &expected_sql);
 }
+
+#[test_connector(preview_features("views"))]
+fn creates_no_m2m_relations_to_views(api: TestApi) {
+    let dm = indoc! {r#"
+        generator js {
+          provider = "prisma-client-javascript"
+          previewFeatures = ["views"]
+        }
+
+        model Organization {
+          id        Int        @id
+          viewUsers ViewUser[]
+        }
+
+        view ViewUser {
+          userId        Int            @id @unique
+          organizations Organization[]
+        }
+    "#};
+
+    api.schema_push_w_datasource(dm).send().assert_green();
+
+    api.assert_schema().assert_has_no_view("ViewUser");
+    api.assert_schema().assert_table("Organization", |table| {
+        table.assert_has_column("id").assert_does_not_have_column("viewUsers")
+    });
+}