Specs for showing the multiple connections working.

I'm seeing an issue with inserts on a different database causing
problems. I'll have to address that next.

spec/spec_helper.cr

@@ -15,6 +15,18 @@ def initdb
   {% end %}
 end
 
+def init_secondary_db
+  system("echo \"DROP DATABASE IF EXISTS clear_secondary_spec;\" | psql -U postgres")
+  system("echo \"CREATE DATABASE clear_secondary_spec;\" | psql -U postgres")
+  system("echo \"CREATE TABLE models_post_stats (id serial PRIMARY KEY, post_id INTEGER);\" | psql -U postgres clear_secondary_spec")
+  system("echo \"INSERT INTO models_post_stats VALUES (1, 1);\" | psql -U postgres clear_secondary_spec")
+
+  Clear::SQL.init({
+    "deafult" => "postgres://postgres@localhost/clear_spec",
+    "secondary" => "postgres://postgres@localhost/clear_secondary_spec",
+  })
+end
+
 def reinit_migration_manager
     Clear::Migration::Manager.instance.reinit!
 end

src/clear/sql/insert_query.cr

@@ -61,7 +61,7 @@ class Clear::SQL::InsertQuery
     o = {} of String => ::Clear::SQL::Any
 
     if @returning.nil?
-      Clear::SQL.execute(to_sql)
+      Clear::SQL.execute(self.connection_name, to_sql)
     else
       # return {} of String => ::Clear::SQL::Any
       fetch { |x| o = x; break }