3 files changed, 72 insertions, 0 deletions
diff --git a/app/models/group.rb b/app/models/group.rb
new file mode 100644
index 0000000..e0cfaab
--- /dev/null
+++ b/app/models/group.rb
@@ -0,0 +1,11 @@
+class Group < ActiveRecord::Base
+  attr_accessible :name, :active, :comment
+
+  has_many :group_memberships, :dependent => :destroy
+  has_many :group_permissions, :dependent => :destroy
+  has_many :permittances, :foreign_key => :target_group_id, :class_name => "GroupPermission", :dependent => :destroy
+
+  def to_s
+    self.name
+  end
+end
diff --git a/app/models/group_membership.rb b/app/models/group_membership.rb
new file mode 100644
index 0000000..0f04ae1
--- /dev/null
+++ b/app/models/group_membership.rb
@@ -0,0 +1,37 @@
+class GroupMembership < ActiveRecord::Base
+  attr_accessible :group_id, :item_type, :item_id
+
+  belongs_to :group
+  belongs_to :item, :polymorphic => true
+
+  validates :item_id,
+            :presence => true,
+            :uniqueness => { :scope => [:group_id, :item_type] }
+
+  validates :item_type,
+            :presence => true,
+            :uniqueness => { :scope => [:group_id, :item_id] }
+
+  validate  :validate_item_type_consitency
+
+  validates :item,
+            :presence => true
+
+  def to_s
+    "#{self.item_type}: #{self.item}"
+  end
+
+  def item_type_allowed
+    fist_item = self.group.group_memberships.first.try(:item)
+    if fist_item
+      return fist_item.class.name
+    end
+  end
+
+  def validate_item_type_consitency
+    type_allowed = self.item_type_allowed
+    if type_allowed && type_allowed != self.item_type
+      errors.add(:item_type, "must be of type: #{type_allowed}")
+    end
+  end
+end
diff --git a/app/models/group_permission.rb b/app/models/group_permission.rb
new file mode 100644
index 0000000..fe988ba
--- /dev/null
+++ b/app/models/group_permission.rb
@@ -0,0 +1,24 @@
+class GroupPermission < ActiveRecord::Base
+  attr_accessible :group_id, :permission, :target_group_id
+
+  PERMISSION_TYPES = ['pickup']
+  
+  belongs_to :group
+  belongs_to :target_group, :class_name => "Group"
+
+  validates :target_group_id,
+            :presence => true,
+            :uniqueness => { :scope => [:group_id, :permission] }
+
+  validates :target_group,
+            :presence => true
+
+  validates :permission,
+            :presence => true,
+            :uniqueness => { :scope => [:group_id, :target_group_id] },
+            :inclusion => { :in => PERMISSION_TYPES }
+
+  def to_s
+    "#{self.permission} => #{self.target_group}"
+  end
+end