[MODEL] Override ActiveRecord::Base.inspect to prevent ActiveRecord::ConnectionNotEstablished errors

Rails 4 prevents these errors by default, see:

https://github.com/rails/rails/blob/v4.0.2/activerecord/lib/active_record/core.rb#L108-L122

Related: elastic#6

Author: karmi

elasticsearch-model/lib/elasticsearch/model.rb

@@ -6,6 +6,8 @@
 
 require 'elasticsearch/model/support/forwardable'
 
+require 'elasticsearch/model/version'
+
 require 'elasticsearch/model/client'
 
 require 'elasticsearch/model/adapter'
@@ -29,7 +31,7 @@
 require 'elasticsearch/model/response/records'
 require 'elasticsearch/model/response/pagination'
 
-require 'elasticsearch/model/version'
+require 'elasticsearch/model/ext/active_record'
 
 if defined?(::Kaminari)
   Elasticsearch::Model::Response::Response.__send__ :include, Elasticsearch::Model::Response::Pagination::Kaminari

elasticsearch-model/lib/elasticsearch/model/ext/active_record.rb

@@ -0,0 +1,14 @@
+# Prevent `MyModel.inspect` failing with `ActiveRecord::ConnectionNotEstablished`
+# (triggered by elasticsearch-model/lib/elasticsearch/model.rb:79:in `included')
+#
+ActiveRecord::Base.instance_eval do
+  class << self
+    def inspect_with_rescue
+      inspect_without_rescue
+    rescue ActiveRecord::ConnectionNotEstablished
+      "#{self}(no database connection)"
+    end
+
+    alias_method_chain :inspect, :rescue
+  end
+end if defined?(ActiveRecord) && ActiveRecord::VERSION::STRING < '4'