Set size of the field to 60 (was 20) since Devise generated tokens ar…

…e longer than before (if we cut generated token to 20, it could occur token conflicts since Devise ensure there is no conflict comparing the 60-chars generated tokens)

lib/devise_invitable/schema.rb

@@ -1,8 +1,31 @@
 module DeviseInvitable
   module Schema
-    # Creates invitation_token and invitation_sent_at.
+    # Add invitation_token and invitation_sent_at columns in the resource's database table.
+    #
+    # Examples
+    #
+    #   # For a new resource migration:
+    #   create_table :the_resources do
+    #     t.database_authenticatable :null => false # you need at least this
+    #     t.invitable
+    #     ...
+    #   end
+    #   add_index :the_resources, :invitation_token # for invitable
+    #
+    #   # or if the resource's table already exists, define a migration and put this in:
+    #   change_table :the_resources do |t|
+    #     t.string   :invitation_token, :limit => 60
+    #     t.datetime :invitation_sent_at
+    #     t.datetime :invitation_accepted_at
+    #     t.index    :invitation_token # for invitable
+    #   end
+    #
+    #   # And allow encrypted_password to be null:
+    #   change_column :the_resources, :encrypted_password, :string, :null => true
+    #   # the following line is only if you use Devise's encryptable module!
+    #   change_column :the_resources, :password_salt,      :string, :null => true
     def invitable
-      apply_devise_schema :invitation_token,   String, :limit => 20
+      apply_devise_schema :invitation_token,   String, :limit => 60
       apply_devise_schema :invitation_sent_at, DateTime
     end
   end

lib/generators/active_record/templates/migration.rb

@@ -1,7 +1,7 @@
 class DeviseInvitableAddTo<%= table_name.camelize %> < ActiveRecord::Migration
   def self.up
     change_table :<%= table_name %> do |t|
-      t.string   :invitation_token, :limit => 20
+      t.string   :invitation_token, :limit => 60
       t.datetime :invitation_sent_at
       t.index    :invitation_token # for invitable
     end