valid mood unique per day per user

app/controllers/day_logs_controller.rb

@@ -7,6 +7,7 @@ class DayLogsController < ApplicationController
     @day_log = Current.user.day_logs.build(day_log_params)
 
     if @day_log.save
+      handle_mood(@day_log.day, params[:day_log][:mode_id])
       redirect_to root_path
     else
       render :new, status: :unprocessable_entity
@@ -15,6 +16,18 @@ class DayLogsController < ApplicationController
 
   private
 
+  def handle_mood(day, mode_id)
+    return if mode_id.blank?
+
+    mood = Current.user.moods.find_by(recorded_at: day.beginning_of_day..day.end_of_day)
+
+    if mood
+      mood.update(mode_id: mode_id)
+    else
+      Current.user.moods.create(mode_id: mode_id, recorded_at: day.to_datetime)
+    end
+  end
+
   def day_log_params
     params.expect(day_log: [ :day, :info ])
   end

app/models/mood.rb

@@ -1,4 +1,19 @@
 class Mood < ApplicationRecord
   belongs_to :user
   belongs_to :mode
+
+  validates :recorded_at, presence: true
+  validate :unique_per_day_and_user
+
+  private
+
+  def unique_per_day_and_user
+    return unless recorded_at && user
+
+    existing = user.moods.where.not(id: id).any? do |mood|
+      mood.recorded_at.to_date == recorded_at.to_date
+    end
+
+    errors.add(:recorded_at, :taken) if existing
+  end
 end

app/views/day_logs/new.html.haml

@@ -12,4 +12,10 @@
     = f.label :info
     = f.text_area :info
 
+  .field
+    = label_tag :mode_id, "Mode"
+    = select_tag "day_log[mode_id]",
+        options_from_collection_for_select(Current.user.modes, :id, :label),
+        include_blank: true
+
   = f.submit

spec/factories/modes.rb

@@ -1,7 +1,6 @@
 FactoryBot.define do
   factory :mode do
     label { "MyString" }
-    slug { "MyString" }
     color { "MyString" }
     user { nil }
   end

spec/factories/moods.rb

@@ -1,7 +1,7 @@
 FactoryBot.define do
   factory :mood do
-    mode { "croisiere" }
+    recorded_at { DateTime.parse("2026-01-15 10:00:00") }
-    recorded_at { DateTime.now }
     association :user
+    association :mode
   end
 end

spec/models/mood_spec.rb

@@ -1,7 +1,46 @@
 require 'rails_helper'
 
-describe Mood, type: :model do
+describe Mood do
-  it 'works' do
+  let(:user) { create(:user) }
-    expect(true)
+  let(:mode) { create(:mode, user: user) }
+
+  subject { build(:mood, user: user, mode: mode, recorded_at: DateTime.parse("2026-01-15 10:00:00")) }
+
+  it { is_expected.to be_valid }
+
+  describe "validations" do
+    it "is invalid without a user" do
+      subject.user = nil
+      expect(subject).not_to be_valid
+    end
+
+    it "is invalid without a mode" do
+      subject.mode = nil
+      expect(subject).not_to be_valid
+    end
+
+    it "is invalid without a recorded_at" do
+      subject.recorded_at = nil
+      expect(subject).not_to be_valid
+    end
+  end
+
+  describe "uniqueness per day and user" do
+    it "is invalid if a mood already exists for the same day and user" do
+      create(:mood, user: user, mode: mode, recorded_at: DateTime.parse("2026-01-15 18:00:00"))
+      expect(subject).not_to be_valid
+    end
+
+    it "is valid if the same day exists but for a different user" do
+      other_user = create(:user)
+      other_mode = create(:mode, user: other_user)
+      create(:mood, user: other_user, mode: other_mode, recorded_at: DateTime.parse("2026-01-15 10:00:00"))
+      expect(subject).to be_valid
+    end
+
+    it "is valid if the same user has a mood on a different day" do
+      create(:mood, user: user, mode: mode, recorded_at: DateTime.parse("2026-01-14 10:00:00"))
+      expect(subject).to be_valid
+    end
   end
 end

spec/requests/day_logs_spec.rb

@@ -1,8 +1,9 @@
 require 'rails_helper'
 
-RSpec.describe "DayLogs", type: :request do
+describe "DayLogs", type: :request do
   let(:user) { create(:user) }
-  let(:day) { Date.new(2026, 1, 15) }
+  let(:mode) { create(:mode, user: user) }
+  let(:day) { Date.parse("2026-01-15") }
 
   describe "GET /day_logs/new" do
     context "when not authenticated" do
@@ -34,12 +35,56 @@ RSpec.describe "DayLogs", type: :request do
       before { login_as(user) }
 
       context "with valid params" do
+        context "without mode" do
           it "creates a day_log" do
             expect {
               post day_logs_path, params: { day_log: { day: day, info: "Une info" } }
             }.to change(DayLog, :count).by(1)
           end
 
+          it "does not create a mood" do
+            expect {
+              post day_logs_path, params: { day_log: { day: day, info: "Une info" } }
+            }.not_to change(Mood, :count)
+          end
+        end
+
+        context "with mode, no existing mood" do
+          it "creates a day_log" do
+            expect {
+              post day_logs_path, params: { day_log: { day: day, info: "Une info", mode_id: mode.id } }
+            }.to change(DayLog, :count).by(1)
+          end
+
+          it "creates a mood" do
+            expect {
+              post day_logs_path, params: { day_log: { day: day, info: "Une info", mode_id: mode.id } }
+            }.to change(Mood, :count).by(1)
+          end
+        end
+
+        context "with mode, existing mood" do
+          let!(:existing_mood) { create(:mood, user: user, mode: mode, recorded_at: DateTime.parse("2026-01-15 08:00:00")) }
+          let(:other_mode) { create(:mode, user: user) }
+
+          it "creates a day_log" do
+            expect {
+              post day_logs_path, params: { day_log: { day: day, info: "Une info", mode_id: other_mode.id } }
+            }.to change(DayLog, :count).by(1)
+          end
+
+          it "does not create a new mood" do
+            expect {
+              post day_logs_path, params: { day_log: { day: day, info: "Une info", mode_id: other_mode.id } }
+            }.not_to change(Mood, :count)
+          end
+
+          it "updates the existing mood mode" do
+            post day_logs_path, params: { day_log: { day: day, info: "Une info", mode_id: other_mode.id } }
+            expect(existing_mood.reload.mode).to eq(other_mode)
+          end
+        end
+
         it "redirects after creation" do
           post day_logs_path, params: { day_log: { day: day, info: "Une info" } }
           expect(response).to have_http_status(:redirect)