1 files changed, 52 insertions, 2 deletions

diff --git a/app/models/list.rb b/app/models/list.rb
index ccadd39bda2..ae7085f05a7 100644
--- a/app/models/list.rb
+++ b/app/models/list.rb
@@ -1,9 +1,11 @@
 # frozen_string_literal: true
 
 class List < ApplicationRecord
+  include Importable
+
   belongs_to :board
   belongs_to :label
-  include Importable
+  has_many :list_user_preferences
 
   enum list_type: { backlog: 0, label: 1, closed: 2, assignee: 3, milestone: 4 }
 
@@ -16,9 +18,24 @@ class List < ApplicationRecord
 
   scope :destroyable, -> { where(list_type: list_types.slice(*destroyable_types).values) }
   scope :movable, -> { where(list_type: list_types.slice(*movable_types).values) }
-  scope :preload_associations, -> { preload(:board, :label) }
+
+  scope :preload_associations, -> (user) do
+    preload(:board, label: :priorities)
+      .with_preferences_for(user)
+  end
+
   scope :ordered, -> { order(:list_type, :position) }
 
+  # Loads list with preferences for given user
+  # if preferences exists for user or not
+  scope :with_preferences_for, -> (user) do
+    return unless user
+
+    includes(:list_user_preferences).where(list_user_preferences: { user_id: [user.id, nil] })
+  end
+
+  alias_method :preferences, :list_user_preferences
+
   class << self
     def destroyable_types
       [:label]
@@ -29,6 +46,31 @@ class List < ApplicationRecord
     end
   end
 
+  def preferences_for(user)
+    return preferences.build unless user
+
+    if preferences.loaded?
+      preloaded_preferences_for(user)
+    else
+      preferences.find_or_initialize_by(user: user)
+    end
+  end
+
+  def preloaded_preferences_for(user)
+    user_preferences =
+      preferences.find do |preference|
+        preference.user_id == user.id
+      end
+
+    user_preferences || preferences.build(user: user)
+  end
+
+  def update_preferences_for(user, preferences = {})
+    return unless user
+
+    preferences_for(user).update(preferences)
+  end
+
   def destroyable?
     self.class.destroyable_types.include?(list_type&.to_sym)
   end
@@ -43,6 +85,14 @@ class List < ApplicationRecord
 
   def as_json(options = {})
     super(options).tap do |json|
+      json[:collapsed] = false
+
+      if options.key?(:collapsed)
+        preferences = preferences_for(options[:current_user])
+
+        json[:collapsed] = preferences.collapsed?
+      end
+
       if options.key?(:label)
         json[:label] = label.as_json(
           project: board.project,