Limit shown statuses to the project

Only issue statuses allowed in workflows of active trackers are shown.

Fixes #121
Fixes #127
Fixes #130

CHANGELOG.md

@@ -7,6 +7,7 @@ This project adheres to [Semantic Versioning](http://semver.org/) and [Keep a Ch
 
 ### New
 
+- Limit shown statuses to the one available in the project (#121, #127, #130)
 - Store dashboard settings in user preferences (#39)
 
 ### Changes

app/models/rdb_dashboard.rb

@@ -63,6 +63,17 @@ def issues
       .includes(:assigned_to, :time_entries, :tracker, :status, :priority, :fixed_version)
   end
 
+  def statuses
+    ids = WorkflowTransition
+      .where(tracker: trackers)
+      .distinct
+      .pluck(:old_status_id, :new_status_id)
+      .flatten
+      .uniq
+
+    IssueStatus.where(id: ids).sorted
+  end
+
   def versions
     @versions ||= Version.where(project_id: project_ids).distinct
   end

app/models/rdb_taskboard.rb

@@ -34,7 +34,7 @@ def build
     # Init columns
     options[:hide_columns] ||= []
 
-    done_statuses = IssueStatus.sorted.select do |status|
+    done_statuses = statuses.select do |status|
       next true if status.is_closed?
 
       add_column RdbColumn.new(

spec/models/rdb_dashboard/statuses_spec.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require File.expand_path('../../spec_helper', __dir__)
+
+describe RdbDashboard do
+  fixtures %i[
+    enabled_modules
+    issue_statuses
+    projects
+    projects_trackers
+    trackers
+    workflows
+  ]
+
+  subject(:dashboard) { RdbDashboard.new(project, options, params) }
+
+  let(:project) { Project.find(1) }
+  let(:options) { {} }
+  let(:params) { {} }
+
+  describe '#statuses' do
+    subject(:statuses) { dashboard.statuses }
+
+    before do
+      # Delete all workflow rules related to status 6 (Rejected). We will test,
+      # that this now unused issue status does not appear on the board.
+      WorkflowTransition.where('new_status_id = :id OR old_status_id = :id', id: 6).delete_all
+    end
+
+    it 'returns the project' do
+      expect(statuses.map(&:id)).to eq [1, 2, 3, 4, 5]
+    end
+  end
+end