Merge tag 'v5.2.1' into release-5.2.2

Author: rafiss

README.md

@@ -7,7 +7,7 @@ CockroachDB adapter for ActiveRecord 4 and 5. This is a lightweight extension of
 Add this line to your project's Gemfile:
 
 ```ruby
-gem 'activerecord-cockroachdb-adapter', '~> 0.2'
+gem 'activerecord-cockroachdb-adapter', '~> 5.2.0'
 ```
 
 If you're using Rails 4.x, use the `0.1.x` versions of this gem.

activerecord-cockroachdb-adapter.gemspec

@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |spec|
   spec.name          = "activerecord-cockroachdb-adapter"
-  spec.version       = "5.2.0"
+  spec.version       = "5.2.1"
   spec.licenses      = ["Apache-2.0"]
   spec.authors       = ["Cockroach Labs"]
   spec.email         = ["[email protected]"]

lib/active_record/connection_adapters/cockroachdb_adapter.rb

@@ -212,6 +212,10 @@ def supports_virtual_columns?
         false
       end
 
+      def supports_string_to_array_coercion?
+        @crdb_version >= 202
+      end
+
       # This is hardcoded to 63 (as previously was in ActiveRecord 5.0) to aid in
       # migration from PostgreSQL to CockroachDB. In practice, this limitation
       # is arbitrary since CockroachDB supports index name lengths and table alias
@@ -335,7 +339,8 @@ def configure_connection
         def extract_value_from_default(default)
           super ||
             extract_escaped_string_from_default(default) ||
-            extract_time_from_default(default)
+            extract_time_from_default(default) ||
+            extract_empty_array_from_default(default)
         end
 
         # Both PostgreSQL and CockroachDB use C-style string escapes under the
@@ -377,6 +382,15 @@ def extract_time_from_default(default)
           nil
         end
 
+        # CockroachDB stores default values for arrays in the `ARRAY[...]` format.
+        # In general, it is hard to parse that, but it is easy to handle the common
+        # case of an empty array.
+        def extract_empty_array_from_default(default)
+          return unless supports_string_to_array_coercion? 
+          return unless default =~ /\AARRAY\[\]\z/
+          return "{}"
+        end
+
       # end private
     end
   end

test/excludes/PostgresqlUUIDTest.rb

@@ -1,4 +1,3 @@
 exclude :test_uniqueness_validation_ignores_uuid, "Skipping until we can triage further. See https://github.com/cockroachdb/activerecord-cockroachdb-adapter/issues/48"
-exclude :test_add_column_with_default_array, "Skipping until we can triage further. See https://github.com/cockroachdb/activerecord-cockroachdb-adapter/issues/48"
 exclude :test_change_column_default, "Skipping until we can triage further. See https://github.com/cockroachdb/activerecord-cockroachdb-adapter/issues/48"
 exclude :test_uuid_formats, "Skipping until we can triage further. See https://github.com/cockroachdb/activerecord-cockroachdb-adapter/issues/48"