Added UserTeam core models (team and m-t-m relationships) and updated other models

app/models/user_team_project_relationship.rb

@@ -0,0 +1,24 @@
+class UserTeamProjectRelationship < ActiveRecord::Base
+  attr_accessible :greatest_access, :project_id, :user_team_id
+
+  belongs_to :user_team
+  belongs_to :project
+
+  validates :project,   presence: true
+  validates :user_team, presence: true
+  validate :check_greatest_access
+
+  scope :with_project, ->(project){ where(project_id: project.id) }
+
+  private
+
+  def check_greatest_access
+    errors.add(:base, :incorrect_access_code) unless correct_access?
+  end
+
+  def correct_access?
+    return false if greatest_access.blank?
+    return true if UsersProject.access_roles.has_value?(greatest_access)
+    false
+  end
+end