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# frozen_string_literal: true
require "cases/helper"
require "models/professor"
if ActiveRecord::Base.connection.supports_foreign_tables?
class ForeignTableTest < ActiveRecord::TestCase
self.use_transactional_tests = false
class ForeignProfessor < ActiveRecord::Base
self.table_name = "foreign_professors"
end
class ForeignProfessorWithPk < ForeignProfessor
self.primary_key = "id"
end
def setup
@professor = Professor.create(name: "Nicola")
@connection = ActiveRecord::Base.connection
enable_extension!("postgres_fdw", @connection)
foreign_db_config = ARTest.connection_config["arunit2"]
@connection.execute <<~SQL
CREATE SERVER foreign_server
FOREIGN DATA WRAPPER postgres_fdw
OPTIONS (dbname '#{foreign_db_config["database"]}')
SQL
@connection.execute <<~SQL
CREATE USER MAPPING FOR CURRENT_USER
SERVER foreign_server
SQL
@connection.execute <<~SQL
CREATE FOREIGN TABLE foreign_professors (
id int,
name character varying NOT NULL
) SERVER foreign_server OPTIONS (
table_name 'professors'
)
SQL
end
def teardown
disable_extension!("postgres_fdw", @connection)
@connection.execute <<~SQL
DROP SERVER IF EXISTS foreign_server CASCADE
SQL
end
def test_table_exists
table_name = ForeignProfessor.table_name
assert_not ActiveRecord::Base.connection.table_exists?(table_name)
end
def test_foreign_tables_are_valid_data_sources
table_name = ForeignProfessor.table_name
assert @connection.data_source_exists?(table_name), "'#{table_name}' should be a data source"
end
def test_foreign_tables
assert_equal ["foreign_professors"], @connection.foreign_tables
end
def test_foreign_table_exists
assert @connection.foreign_table_exists?("foreign_professors")
assert @connection.foreign_table_exists?(:foreign_professors)
assert_not @connection.foreign_table_exists?("nonexistingtable")
assert_not @connection.foreign_table_exists?("'")
assert_not @connection.foreign_table_exists?(nil)
end
def test_attribute_names
assert_equal ["id", "name"], ForeignProfessor.attribute_names
end
def test_attributes
professor = ForeignProfessorWithPk.find(@professor.id)
assert_equal @professor.attributes, professor.attributes
end
def test_does_not_have_a_primary_key
assert_nil ForeignProfessor.primary_key
end
def test_insert_record
# Explicit `id` here to avoid complex configurations to implicitly work with remote table
ForeignProfessorWithPk.create!(id: 100, name: "Leonardo")
professor = ForeignProfessorWithPk.last
assert_equal "Leonardo", professor.name
end
def test_update_record
professor = ForeignProfessorWithPk.find(@professor.id)
professor.name = "Albert"
professor.save!
professor.reload
assert_equal "Albert", professor.name
end
def test_delete_record
professor = ForeignProfessorWithPk.find(@professor.id)
assert_difference("ForeignProfessor.count", -1) { professor.destroy }
end
end
end
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