added bans

app/models/ban.rb

@@ -0,0 +1,53 @@
+class Ban < ActiveRecord::Base
+  after_create :update_feedback
+  belongs_to :user
+  belongs_to :banner, :class_name => "User"
+  attr_accessible :reason, :duration, :user_id
+  validate :user_is_inferior
+  
+  def self.is_user_banned?(user)
+    exists?(["user_id = ? AND expires_at > ?", user.id, Time.now])
+  end
+  
+  def self.is_ip_banned?(ip_addr)
+    exists?(["ip_addr = ? AND expires_at > ?", ip_addr, Time.now])
+  end
+  
+  def user_is_inferior
+    if user
+      if user.is_admin?
+        errors[:base] << "You can never ban an admin."      
+        false
+      elsif user.is_moderator? && banner.is_admin?
+        true
+      elsif user.is_moderator?
+        errors[:base] << "Only admins can ban moderators."
+        false
+      elsif banner.is_admin? || banner.is_moderator?
+        true
+      else
+        errors[:base] << "No one else can ban."
+        false
+      end
+    end
+  end
+  
+  def update_feedback
+    if user
+      feedback = user.feedback.build
+      feedback.is_positive = false
+      feedback.body = "Banned: #{reason}"
+      feedback.creator_id = banner_id
+      feedback.save
+    end
+  end
+  
+  def duration=(dur)
+    self.expires_at = dur.to_i.days.from_now
+    @duration = dur
+  end
+  
+  def duration
+    @duration
+  end
+end