def with_scope(method_scoping = {}, action = :merge, &block)
method_scoping = method_scoping.method_scoping if method_scoping.respond_to?(:method_scoping)
method_scoping = method_scoping.inject({}) do |hash, (method, params)|
hash[method] = (params == true) ? params : params.dup
hash
end
method_scoping.assert_valid_keys([ :find, :create ])
if f = method_scoping[:find]
f.assert_valid_keys([ :conditions, :joins, :select, :include, :from, :offset, :limit, :readonly ])
f[:readonly] = true if !f[:joins].blank? && !f.has_key?(:readonly)
end
if action == :merge && current_scoped_methods
method_scoping = current_scoped_methods.inject(method_scoping) do |hash, (method, params)|
case hash[method]
when Hash
if method == :find
(hash[method].keys + params.keys).uniq.each do |key|
merge = hash[method][key] && params[key]
if key == :conditions && merge
hash[method][key] = [params[key], hash[method][key]].collect{ |sql| "( %s )" % sanitize_sql(sql) }.join(" AND ")
elsif key == :include && merge
hash[method][key] = merge_includes(hash[method][key], params[key]).uniq
else
hash[method][key] = hash[method][key] || params[key]
end
end
else
hash[method] = params.merge(hash[method])
end
else
hash[method] = params
end
hash
end
end
self.scoped_methods << method_scoping
begin
yield
ensure
self.scoped_methods.pop
end
end