Add a reasonable to_s method to models

app/models/metasploit/credential/private.rb

@@ -91,5 +91,16 @@ class Metasploit::Credential::Private < ActiveRecord::Base
                 scope: :type
             }
 
+  #
+  # Instance Methods
+  #
+
+  # A string suitable for displaying to the user
+  #
+  # @return [String]
+  def to_s
+    data.to_s
+  end
+
   Metasploit::Concern.run(self)
 end

app/models/metasploit/credential/public.rb

@@ -57,5 +57,16 @@ class Metasploit::Credential::Public < ActiveRecord::Base
             presence: true,
             uniqueness: true
 
+  #
+  # Instance Methods
+  #
+
+  # A string suitable for displaying to the user
+  #
+  # @return [String]
+  def to_s
+    username.to_s
+  end
+
   Metasploit::Concern.run(self)
 end

app/models/metasploit/credential/realm.rb

@@ -95,5 +95,14 @@ def self.key_set
     @key_set ||= Set.new Metasploit::Model::Realm::Key::ALL
   end
 
+  #
+  # Instance Methods
+  #
+
+  # @return [String]
+  def to_s
+    value.to_s
+  end
+
   Metasploit::Concern.run(self)
 end

app/models/metasploit/credential/ssh_key.rb

@@ -64,6 +64,14 @@ def private?
     end
   end
 
+  # The {#data key data}'s fingerprint, suitable for displaying to the
+  # user.
+  #
+  # @return [String]
+  def to_s
+    data ? openssl_pkey_pkey.fingerprint : ''
+  end
+
   private
 
   # Converts the private key file data in {#data} to an `OpenSSL::PKey::PKey` subclass instance.