Fix REST API tests (#4279)

* Conftest: check values instead of keys

* Rename SQL script for db restoring

* Use SQL dump file instead of custom format

* Use SQL dump file instead of custom format

* Update README

* Conftest: fix scope for restore_db

tests/rest_api/README.md

@@ -63,7 +63,7 @@ for i, color in enumerate(colormap):
 To backup DB and data volume, please use commands below.
 
 ```console
-docker exec cvat_db pg_dump -c -C -Fc -U root -d cvat > assets/cvat_db.dump
+docker exec cvat_db pg_dump -c -Fp -U root -d cvat > assets/cvat_db/cvat_db.sql
 docker run --rm --volumes-from cvat ubuntu tar -cjv /home/django/data > assets/cvat_data.tar.bz2
 ```
 
@@ -81,7 +81,7 @@ python utils/dump_objects.py
 To restore DB and data volume, please use commands below.
 
 ```console
-cat assets/cvat_db/cvat_db.dump | docker exec -i cvat_db pg_restore -1 -c -U root -d cvat
+cat assets/cvat_db/cvat_db.sql | docker exec -i cvat_db psql -U root -d cvat
 cat assets/cvat_data.tar.bz2 | docker run --rm -i --volumes-from cvat ubuntu tar -xj --strip 3 -C /home/django/data
 ```
 
@@ -93,7 +93,7 @@ cat assets/cvat_data.tar.bz2 | docker run --rm -i --volumes-from cvat ubuntu tar
    you have json description of all objects together with cvat_db.sql, it will
    be possible to recreate them manually.
 
-1. How to upgrade cvat_data.tar.bz2 and cvat_db.dump?
+1. How to upgrade cvat_data.tar.bz2 and cvat_db.sql?
 
    After every commit which changes the layout of DB and data directory it is
    possible to break these files. But failed tests should be a clear indicator

tests/rest_api/assets/cvat_db/restore_db.sql

@@ -0,0 +1,7 @@
+SELECT pg_terminate_backend(pg_stat_activity.pid)
+FROM pg_stat_activity
+WHERE pg_stat_activity.datname = 'cvat' AND pid <> pg_backend_pid();
+
+DROP DATABASE cvat;
+
+CREATE DATABASE cvat WITH TEMPLATE test_db;

tests/rest_api/conftest.py

@@ -20,15 +20,18 @@ def restore_data_volume():
         '--strip 3 -C /home/django/data -xjf /mnt/cvat_data.tar.bz2'
     run(command.split(), check=True) #nosec
 
+def restore_cvat_db():
+    cvat_db_container('psql -U root -d postgres -f /cvat_db/restore_db.sql')
+
 def drop_test_db():
-    cvat_db_container('pg_restore -c -U root -d cvat /cvat_db/cvat_db.dump')
+    restore_cvat_db()
     cvat_db_container('rm -rf /cvat_db')
     cvat_db_container('dropdb test_db')
 
 def create_test_db():
     docker_cp(source=osp.join(ASSETS_DIR, 'cvat_db'), target='cvat_db:/')
     cvat_db_container('createdb test_db')
-    cvat_db_container('pg_restore -U root -d test_db /cvat_db/cvat_db.dump')
+    cvat_db_container('psql -U root -d test_db -f /cvat_db/cvat_db.sql')
 
 @pytest.fixture(scope='session', autouse=True)
 def init_test_db():
@@ -44,8 +47,8 @@ def init_test_db():
     drop_test_db()
 
 @pytest.fixture(scope='function', autouse=True)
-def restore_cvat_db():
-    cvat_db_container('psql -U root -d postgres -f /cvat_db/cvat_db.sql')
+def restore():
+    restore_cvat_db()
 
 @pytest.fixture(scope='module')
 def users():
@@ -77,7 +80,7 @@ def users_by_name(users):
 def find_users(test_db):
     def find(**kwargs):
         assert len(kwargs) > 0
-        assert any(kwargs)
+        assert any(kwargs.values())
 
         data = test_db
         kwargs = dict(filter(lambda a: a[1] is not None, kwargs.items()))