新增：邀请用户链接生成

app/models/project_invite_link.rb

@@ -0,0 +1,57 @@
+# == Schema Information
+#
+# Table name: project_invite_links
+#
+#  id         :integer          not null, primary key
+#  project_id :integer
+#  user_id    :integer
+#  role       :integer          default("4")
+#  is_apply   :boolean          default("1")
+#  sign       :string(255)
+#  expired_at :datetime
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+# Indexes
+#
+#  index_project_invite_links_on_project_id  (project_id)
+#  index_project_invite_links_on_sign        (sign)
+#  index_project_invite_links_on_user_id     (user_id)
+#
+
+class ProjectInviteLink < ApplicationRecord
+
+  default_scope { where("expired_at > ?", Time.now).or(where(expired_at: nil)) }
+
+  belongs_to :project
+  belongs_to :user
+  has_many :applied_projects
+
+  scope :with_project_id, -> (project_id) {where(project_id: project_id)}
+  scope :with_user_id, -> (user_id) {where(user_id: user_id)}
+
+  enum role: {manager: 3, developer: 4, reporter: 5}
+
+  before_create :set_old_data_expired_at
+
+  def self.random_hex_sign
+    SecureRandom.hex
+  end
+
+  def self.build!(project, user, role="developer", is_apply=true)
+    self.create!(
+      project_id: project&.id, 
+      user_id: user&.id, 
+      role: role, 
+      is_apply: is_apply, 
+      sign: random_hex_sign
+    )
+  end
+
+  private 
+  def set_old_data_expired_at
+    ProjectInviteLink.where(user_id: self.user_id, project_id: self.project).update_all(expired_at: Time.now)
+  end
+
+
+end