Better error message for calling columns_hash

When a record does not have a table name, as in the case for a record
with `self.abstract_class = true` and no `self.table_name` set the error
message raises a cryptic:
"ActiveRecord::StatementInvalid: Could not find table ''" this patch now
raises a new `TableNotSpecified Error`

Fixes: #36274

Co-Authored-By: Eugene Kenny <elkenny@gmail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 983a46a2d0..1324bdf9b8 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1415,6 +1415,14 @@ class BasicsTest < ActiveRecord::TestCase
     assert_not_includes SymbolIgnoredDeveloper.columns_hash.keys, "first_name"
   end
 
+  test ".columns_hash raises an error if the record has an empty table name" do
+    expected_message = "FirstAbstractClass has no table configured. Set one with FirstAbstractClass.table_name="
+    exception = assert_raises(ActiveRecord::TableNotSpecified) do
+      FirstAbstractClass.columns_hash
+    end
+    assert_equal expected_message, exception.message
+  end
+
   test "ignored columns have no attribute methods" do
     assert_not_respond_to Developer.new, :first_name
     assert_not_respond_to Developer.new, :first_name=