Improve deprecation messages I encountered during upgrading to 0.10

lib/dm-core/model/relationship.rb

@@ -156,7 +156,7 @@ def belongs_to(name, options = {})
         assert_kind_of 'options', options, Hash
 
         if options.key?(:through)
-          warn "#{self.name}#belongs_to with :through is deprecated, use 'has 1, :#{name}, #{options.inspect}' in #{self.name} instead"
+          warn "#{self.name}#belongs_to with :through is deprecated, use 'has 1, :#{name}, #{options.inspect}' in #{self.name} instead (#{caller[0]})"
           return has(1, name, options)
         end
 
@@ -222,7 +222,7 @@ def assert_valid_options(options)
 
         if options.key?(:class_name)
           assert_kind_of 'options[:class_name]', options[:class_name], String
-          warn '+options[:class_name]+ is deprecated, use :model instead'
+          warn "+options[:class_name]+ is deprecated, use :model instead (#{caller[1]})"
           options[:model] = options.delete(:class_name)
         end
 

lib/dm-core/property.rb

@@ -343,7 +343,7 @@ class Property
     # @api semipublic
     def field(repository_name = nil)
       if repository_name
-        warn "Passing in +repository_name+ to #{self.class}#field is deprecated: #{caller[0]}"
+        warn "Passing in +repository_name+ to #{self.class}#field is deprecated (#{caller[0]})"
 
         if repository_name != self.repository_name
           raise ArgumentError, "Mismatching +repository_name+ with #{self.class}#repository_name (#{repository_name.inspect} != #{self.repository_name.inspect})"
@@ -783,7 +783,7 @@ def initialize(model, name, type, options = {})
       options = options.dup
 
       if TrueClass == type
-        warn "#{type} is deprecated, use Boolean instead"
+        warn "#{type} is deprecated, use Boolean instead at #{caller[2]}"
         type = Types::Boolean
       elsif Integer == type && options.delete(:serial)
         warn "#{type} with explicit :serial option is deprecated, use Serial instead"

lib/dm-core/resource.rb

@@ -20,7 +20,7 @@ def self.extra_inclusions
 
     # @deprecated
     def self.descendants
-      warn 'DataMapper::Resource.descendants is deprecated, use DataMapper::Model.descendants instead'
+      warn "DataMapper::Resource.descendants is deprecated, use DataMapper::Model.descendants instead (#{caller[0]})"
       DataMapper::Model.descendants
     end