Fix Database::Sequel served relation + more friendly require

CHANGELOG.md

@@ -11,6 +11,8 @@
 * Add `Summarizer.bucketize` to distribute attribute values in a number of
   buckets. We support :boundaries, :value_length and :distinct options.
 
+* `require 'bmg/sequel` automatically requires `bmg` itself.
+
 ## 0.22.0 - 2024-05-17
 
 * Add the `minus` operation (also known as set difference, or EXCEPT in SQL).

lib/bmg/database/sequel.rb

@@ -7,13 +7,13 @@ class Sequel < Database
 
       def initialize(sequel_db, options = {})
         @sequel_db = sequel_db
+        @sequel_db = ::Sequel.connect(@sequel_db) unless @sequel_db.is_a?(::Sequel::Database)
       end
 
       def method_missing(name, *args, &bl)
         return super(name, *args, &bl) unless args.empty? && bl.nil?
         raise NotSuchRelationError(name.to_s) unless @sequel_db.table_exists?(name)
-        table = @sequel_db[name]
-        rel_for(table)
+        rel_for(name)
       end
 
       def each_relation_pair

lib/bmg/sequel.rb

@@ -1,3 +1,4 @@
+require 'bmg'
 require 'bmg/sql'
 require 'sequel'
 require 'predicate/sequel'