Define stats and result permissions with scopes

When defining abilities, scopes cover more cases because they can be
used to check permissions for a record and to filter a collection. Ruby
blocks can only be used to check permissions for a record.

Note the `Budget::Phase.kind_or_later` name sounds funny, probably
because we use the word "phase" for both an an attribute in the budgets
table and an object associated with the budget, and so naming methods
for a budget phase is a bit tricky.

app/models/abilities/everyone.rb

@@ -7,20 +7,16 @@ module Abilities
       can [:read, :map, :summary, :share], Proposal
       can :read, Comment
       can :read, Poll
-      can :results, Poll do |poll|
-        poll.expired? && poll.results_enabled?
-      end
-      can :stats, Poll do |poll|
-        poll.expired? && poll.stats_enabled?
-      end
+      can :results, Poll, id: Poll.expired.results_enabled.ids
+      can :stats, Poll, id: Poll.expired.stats_enabled.ids
       can :read, Poll::Question
       can :read, User
       can [:read, :welcome], Budget
       can [:read], Budget
       can [:read], Budget::Group
       can [:read, :print, :json_data], Budget::Investment
-      can(:read_results, Budget) { |budget| budget.results_enabled? && budget.finished? }
-      can(:read_stats, Budget) { |budget| budget.stats_enabled? && budget.valuating_or_later? }
+      can :read_results, Budget, id: Budget.finished.results_enabled.ids
+      can :read_stats, Budget, id: Budget.valuating_or_later.stats_enabled.ids
       can :read_executions, Budget, phase: "finished"
       can :new, DirectMessage
       can [:read, :debate, :draft_publication, :allegations, :result_publication,

app/models/budget.rb

@@ -47,6 +47,7 @@ class Budget < ApplicationRecord
   scope :reviewing, -> { where(phase: "reviewing") }
   scope :selecting, -> { where(phase: "selecting") }
   scope :valuating, -> { where(phase: "valuating") }
+  scope :valuating_or_later, -> { where(phase: Budget::Phase.kind_or_later("valuating")) }
   scope :publishing_prices, -> { where(phase: "publishing_prices") }
   scope :balloting, -> { where(phase: "balloting") }
   scope :reviewing_ballots, -> { where(phase: "reviewing_ballots") }

app/models/budget/phase.rb

@@ -32,6 +32,10 @@ class Budget
       define_singleton_method(phase) { find_by(kind: phase) }
     end
 
+    def self.kind_or_later(phase)
+      PHASE_KINDS[PHASE_KINDS.index(phase)..-1]
+    end
+
     def next_enabled_phase
       next_phase&.enabled? ? next_phase : next_phase&.next_enabled_phase
     end
@@ -92,7 +96,7 @@ class Budget
       end
 
       def in_phase_or_later?(phase)
-        PHASE_KINDS.index(kind) >= PHASE_KINDS.index(phase)
+        self.class.kind_or_later(phase).include?(kind)
       end
   end
 end

app/models/concerns/reportable.rb

@@ -4,6 +4,10 @@ module Reportable
   included do
     has_one :report, as: :process, inverse_of: :process, dependent: :destroy
     accepts_nested_attributes_for :report
+
+    Report::KINDS.each do |kind|
+      scope "#{kind}_enabled", -> { joins(:report).where("reports.#{kind}": true) }
+    end
   end
 
   def report

spec/models/budget_spec.rb

@@ -7,6 +7,33 @@ describe Budget do
   it_behaves_like "reportable"
   it_behaves_like "globalizable", :budget
 
+  describe "scopes" do
+    describe ".open" do
+      it "returns all budgets that are not in the finished phase" do
+        (Budget::Phase::PHASE_KINDS - ["finished"]).each do |phase|
+          budget = create(:budget, phase: phase)
+          expect(Budget.open).to include(budget)
+        end
+      end
+    end
+
+    describe ".valuating_or_later" do
+      it "returns budgets valuating or later" do
+        valuating = create(:budget, :valuating)
+        finished = create(:budget, :finished)
+
+        expect(Budget.valuating_or_later).to match_array([valuating, finished])
+      end
+
+      it "does not return budgets which haven't reached valuation" do
+        create(:budget, :drafting)
+        create(:budget, :selecting)
+
+        expect(Budget.valuating_or_later).to be_empty
+      end
+    end
+  end
+
   describe "name" do
     before do
       budget.update(name_en: "object name")
@@ -172,15 +199,6 @@ describe Budget do
     end
   end
 
-  describe "#open" do
-    it "returns all budgets that are not in the finished phase" do
-      (Budget::Phase::PHASE_KINDS - ["finished"]).each do |phase|
-        budget = create(:budget, phase: phase)
-        expect(Budget.open).to include(budget)
-      end
-    end
-  end
-
   describe "heading_price" do
     it "returns the heading price if the heading provided is part of the budget" do
       heading = create(:budget_heading, price: 100, budget: budget)

spec/models/concerns/reportable.rb

@@ -1,6 +1,36 @@
 shared_examples "reportable" do
   let(:reportable) { create(model_name(described_class)) }
 
+  describe "scopes" do
+    describe ".results_enabled" do
+      it "includes records with results enabled" do
+        reportable.update!(results_enabled: true)
+
+        expect(described_class.results_enabled).to eq [reportable]
+      end
+
+      it "does not include records without results enabled" do
+        reportable.update!(results_enabled: false)
+
+        expect(described_class.results_enabled).to be_empty
+      end
+    end
+
+    describe ".stats_enabled" do
+      it "includes records with stats enabled" do
+        reportable.update!(stats_enabled: true)
+
+        expect(described_class.stats_enabled).to eq [reportable]
+      end
+
+      it "does not include records without stats enabled" do
+        reportable.update!(stats_enabled: false)
+
+        expect(described_class.stats_enabled).to be_empty
+      end
+    end
+  end
+
   describe "#results_enabled" do
     it "can write and read the attribute" do
       reportable.results_enabled = true