"PG::InvalidTextRepresentation: ERROR: missing dimension value" for Array param

[beno]

I am using an Array type parameter an run into the following error when writing to the database.

SEQUEL DEPRECATION WARNING: Automatically typecasting a hash or array to string for a string column is deprecated and will be removed in Sequel 4.0.  Either typecast the input manually or use the looser_typecasting extension.
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/database/misc.rb:498:in `typecast_value_string'
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/database/misc.rb:289:in `typecast_value'
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/model/base.rb:1988:in `typecast_value'
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/model/base.rb:1056:in `[]='
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/model/base.rb:769:in `tags='
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/model/base.rb:1922:in `block in set_restricted'
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/model/base.rb:1919:in `each'
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/model/base.rb:1919:in `set_restricted'
.../bundle/ruby/2.1.0/gems/sequel-3.48.0/lib/sequel/model/base.rb:1414:in `set'
.../bundle/ruby/2.1.0/bundler/gems/rack-push-notification-74486fdea05a/lib/rack/push-notification.rb:37:in `block in <class:PushNotification>'
Sequel::DatabaseError - PG::InvalidTextRepresentation: ERROR:  missing dimension value
LINE 1: ...ags", "timezone", "token") VALUES ('nl_NL', 'en', '["iPhone ...
                             ^

More specifically, to resolve a conflict I have updated the dependencies of 'rack-push-notification' and the 'tags' parameter gives me the error. For completeness sake, the action that causes the error looks like this:

put '/devices/:token/?' do
  param :languages, Array
  param :tags, Array
  ...

The database column has type 'text[]'.

Even though I smuggled with the dependencies, this looks like a pretty generic thing?

[mattt]

This is an issue with rack-push-notification. sinatra-param coerces to an Array object as expected, but rack-push-notification doesn't have the Postgres pg_array extensions loaded correctly.

Please open an issue for that project, if one does not currently exist.