Remove trailing slashes from source paths (#6102) (#6179)

* Remove trailing slashes from source paths (#6102)

* Run changie

* Handle mypy complaints

* Revert format

.changes/unreleased/Fixes-20221030-102114.yaml

@@ -0,0 +1,7 @@
+kind: Fixes
+body: Remove trailing slashes from source paths (#6102)
+time: 2022-10-30T10:21:14.660221Z
+custom:
+  Author: jmg-duarte
+  Issue: "6102"
+  PR: "6179"

core/dbt/config/project.py

@@ -137,11 +137,10 @@ def _all_source_paths(
     analysis_paths: List[str],
     macro_paths: List[str],
 ) -> List[str]:
-    # We need to turn a list of lists into just a list, then convert to a set to
-    # get only unique elements, then back to a list
-    return list(
-        set(list(chain(model_paths, seed_paths, snapshot_paths, analysis_paths, macro_paths)))
-    )
+    paths = chain(model_paths, seed_paths, snapshot_paths, analysis_paths, macro_paths)
+    # Strip trailing slashes since the path is the same even though the name is not
+    stripped_paths = map(lambda s: s.rstrip("/"), paths)
+    return list(set(stripped_paths))
 
 
 T = TypeVar("T")

tests/functional/configs/test_dupe_paths.py

@@ -49,3 +49,27 @@ def test_config_with_dupe_paths(self, project, dbt_project_yml):
         assert len(results) == 1
         results = run_dbt(["run"])
         assert len(results) == 1
+
+
+class TestDupeStrippedProjectPaths:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "my_model.sql": my_model_sql,
+            "seed.csv": seed_csv,
+            "somedoc.md": somedoc_md,
+            "schema.yml": schema_yml,
+        }
+
+    @pytest.fixture(scope="class")
+    def project_config_update(self):
+        return {
+            "model-paths": ["models/"],
+            "seed-paths": ["models"],
+        }
+
+    def test_config_with_dupe_paths(self, project, dbt_project_yml):
+        results = run_dbt(["seed"])
+        assert len(results) == 1
+        results = run_dbt(["run"])
+        assert len(results) == 1