diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
index cd5efe2bb832d020ca5e0237075089dce8a4e8cd..c203e6c6049dc86219641a9ae94baf4a81ff96f3 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
@@ -34,6 +34,9 @@ def type_cast_from_database(value)
           end
 
           def type_cast_from_user(value)
+            if value.is_a?(::String)
+              value = parse_pg_array(value)
+            end
             type_cast_array(value, :type_cast_from_user)
           end
 
diff --git a/activerecord/test/cases/adapters/postgresql/array_test.rb b/activerecord/test/cases/adapters/postgresql/array_test.rb
index db302b62943cf6efe1f6f0247ff8fce56084855e..042beab23fcbfdce39fad50d4380fd3b2be05d3c 100644
--- a/activerecord/test/cases/adapters/postgresql/array_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/array_test.rb
@@ -264,11 +264,26 @@ def test_datetime_with_timezone_awareness
 
   def test_assigning_non_array_value
     record = PgArray.new(tags: "not-an-array")
-    assert_equal "not-an-array", record.tags
-    e = assert_raises(ActiveRecord::StatementInvalid) do
-      record.save!
-    end
-    assert_instance_of PG::InvalidTextRepresentation, e.original_exception
+    assert_equal [], record.tags
+    assert_equal "not-an-array", record.tags_before_type_cast
+    assert record.save
+    assert_equal record.tags, record.reload.tags
+  end
+
+  def test_assigning_empty_string
+    record = PgArray.new(tags: "")
+    assert_equal [], record.tags
+    assert_equal "", record.tags_before_type_cast
+    assert record.save
+    assert_equal record.tags, record.reload.tags
+  end
+
+  def test_assigning_valid_pg_array_literal
+    record = PgArray.new(tags: "{1,2,3}")
+    assert_equal ["1", "2", "3"], record.tags
+    assert_equal "{1,2,3}", record.tags_before_type_cast
+    assert record.save
+    assert_equal record.tags, record.reload.tags
   end
 
   def test_uniqueness_validation