Added some models

User
Item
Department
Categorie
AssignmentLog
Room

app/models/assignment_log.rb

@@ -0,0 +1,7 @@
+class AssignmentLog < ApplicationRecord
+  belongs_to :item
+  belongs_to :user, optional: true
+  belongs_to :room, optional: true
+
+  validates :assigned_at, presence: true
+end

app/models/assignment_log2.rb

@@ -0,0 +1,5 @@
+class AssignmentLog2 < ApplicationRecord
+  belongs_to :item
+  belongs_to :user
+  belongs_to :room
+end

app/models/category.rb

@@ -0,0 +1,2 @@
+class Category < ApplicationRecord
+end

app/models/department.rb

@@ -0,0 +1,6 @@
+class Department < ApplicationRecord
+  has_many :users, dependent: :nullify
+  has_many :items, through: :users
+
+  validates :name, presence: true, uniqueness: true
+end

app/models/item.rb

@@ -0,0 +1,36 @@
+class Item < ApplicationRecord
+  belongs_to :category
+  belongs_to :user, optional: true # Optional, falls im Raum oder Lager
+  belongs_to :room, optional: true # Optional, falls beim User oder Lager
+  has_many :assignment_logs, dependent: :destroy
+
+  validates :name, :sku, presence: true
+  validates :sticker_id, :serial_number, presence: true, uniqueness: true
+
+  # Validierung: Darf nicht gleichzeitig einem User UND einem Raum gehören
+  validate :either_user_or_room
+
+  # Überwacht Besitzer- oder Raumwechsel für die Historie
+  before_save :track_assignment_changes, if: -> { will_save_change_to_user_id? || will_save_change_to_room_id? }
+
+  private
+
+  def either_user_or_room
+    if user_id.present? && room_id.present?
+      errors.add(:base, "Ein Artikel kann nicht gleichzeitig einem Benutzer und einem Raum zugewiesen sein.")
+    end
+  end
+
+  def track_assignment_changes
+    # 1. Altes Log-Buch schließen, falls es eine vorherige Zuweisung gab
+    if user_id_was.present? || room_id_was.present?
+      last_log = assignment_logs.find_by(user_id: user_id_was, room_id: room_id_was, returned_at: nil)
+      last_log&.update(returned_at: Time.current)
+    end
+
+    # 2. Neues Log-Buch öffnen für den neuen Inhaber oder den neuen Raum
+    if user_id.present? || room_id.present?
+      assignment_logs.build(user_id: user_id, room_id: room_id, assigned_at: Time.current)
+    end
+  end
+end

app/models/room.rb

@@ -0,0 +1,11 @@
+class Room < ApplicationRecord
+  has_many :items, dependent: :nullify
+  has_many :assignment_logs, dependent: :destroy
+  
+  validates :name, presence: true, uniqueness: true
+
+  # Für das Raum-Auswahlfeld im Formular
+  def name_with_building
+    building.present? ? "#{name} (Gebäude #{building})" : name
+  end
+end

app/models/user.rb

@@ -10,13 +10,18 @@ class User < ApplicationRecord
     password_salt.last(10)
   end
 
-
   has_many :sessions, dependent: :destroy
   has_many :events, dependent: :destroy
 
   validates :email, presence: true, uniqueness: true, format: { with: URI::MailTo::EMAIL_REGEXP }
   validates :password, allow_nil: true, length: { minimum: @@min_length_password }
 
+  belongs_to :department, optional: true
+  has_many :items, dependent: :nullify
+  has_many :assignment_logs, dependent: :destroy
+
+  validates :first_name, :last_name, presence: true, on: :update
+
   normalizes :email, with: -> { _1.strip.downcase }
 
   before_validation if: :email_changed?, on: :update do
@@ -39,6 +44,20 @@ class User < ApplicationRecord
     events.create! action: "email_verified"
   end
 
+    # Gibt den vollen Namen zurück
+  def name
+    if first_name.present? && last_name.present?
+      "#{first_name} #{last_name}"
+    else
+      email
+    end
+  end
+
+  # Für das Besitzer-Auswahlfeld im Formular
+  def name_with_department
+    department.present? ? "#{name} (#{department.name})" : name
+  end
+
   def self.min_length_password
     @@min_length_password
   end