Prefer project with exact path to differently cased one when both exist.

app/controllers/application_controller.rb

@@ -118,8 +118,8 @@ class ApplicationController < ActionController::Base
       end
 
       project_path = "#{namespace}/#{id}"
-      @project = Project.find_with_namespace(project_path)
-
+      @project = Project.find_with_namespace(project_path) ||
+        Project.find_with_namespace(project_path, case_sensitive: false)
 
       if @project and can?(current_user, :read_project, @project)
         if @project.path_with_namespace != project_path

app/models/project.rb

@@ -235,7 +235,7 @@ class Project < ActiveRecord::Base
       where('projects.archived = ?', false).where('LOWER(projects.name) LIKE :query', query: "%#{query.downcase}%")
     end
 
-    def find_with_namespace(id)
+    def find_with_namespace(id, case_sensitive: true)
       namespace_path, project_path = id.split('/')
 
       return nil if !namespace_path || !project_path
@@ -243,11 +243,18 @@ class Project < ActiveRecord::Base
       # Use of unscoped ensures we're not secretly adding any ORDER BYs, which
       # have a negative impact on performance (and aren't needed for this
       # query).
-      unscoped.
+      projects = unscoped.
         joins(:namespace).
-        iwhere('namespaces.path' => namespace_path).
-        iwhere('projects.path' => project_path).
-        take
+        iwhere('namespaces.path' => namespace_path)
+
+      projects = 
+        if case_sensitive
+          projects.where('projects.path' => project_path)
+        else
+          projects.iwhere('projects.path' => project_path)
+        end
+      
+      projects.take
     end
 
     def visibility_levels

spec/controllers/projects_controller_spec.rb

@@ -51,16 +51,34 @@ describe ProjectsController do
     end
 
     context "when requested with case sensitive namespace and project path" do
-      it "redirects to the normalized path for case mismatch" do
-        get :show, namespace_id: public_project.namespace.path, id: public_project.path.upcase
+      context "when there is a match with the same casing" do
+        it "loads the project" do
+          get :show, namespace_id: public_project.namespace.path, id: public_project.path
 
-        expect(response).to redirect_to("/#{public_project.path_with_namespace}")
+          expect(assigns(:project)).to eq(public_project)
+          expect(response.status).to eq(200)
+        end
       end
 
-      it "loads the page if normalized path matches request path" do
-        get :show, namespace_id: public_project.namespace.path, id: public_project.path
+      context "when there is a match with different casing" do
+        it "redirects to the normalized path" do
+          get :show, namespace_id: public_project.namespace.path, id: public_project.path.upcase
 
-        expect(response.status).to eq(200)
+          expect(assigns(:project)).to eq(public_project)
+          expect(response).to redirect_to("/#{public_project.path_with_namespace}")
+        end
+
+        context "when there is also a match with the same casing" do
+
+          let!(:other_project) { create(:project, :public, namespace: public_project.namespace, path: public_project.path.upcase) }
+
+          it "loads the exactly matched project" do
+            get :show, namespace_id: public_project.namespace.path, id: public_project.path.upcase
+
+            expect(assigns(:project)).to eq(other_project)
+            expect(response.status).to eq(200)
+          end
+        end
       end
     end
   end