Restore ability to mutate Dotenv::Rails.files

lib/dotenv/rails.rb

@@ -24,7 +24,7 @@
 module Dotenv
   # Rails integration for using Dotenv to load ENV variables from a file
   class Rails < ::Rails::Railtie
-    delegate :files=, :overwrite, :overwrite=, :autorestore, :autorestore=, :logger, :logger=, to: "config.dotenv"
+    delegate :files, :files=, :overwrite, :overwrite=, :autorestore, :autorestore=, :logger, :logger=, to: "config.dotenv"
 
     def initialize
       super()
@@ -42,22 +42,17 @@ def initialize
       )
     end
 
-    # The list of files to load, joined with Rails.root
-    def files
-      config.dotenv.files.map { |file| root.join(file) }
-    end
-
     # Public: Load dotenv
     #
     # This will get called during the `before_configuration` callback, but you
     # can manually call `Dotenv::Rails.load` if you needed it sooner.
     def load
-      Dotenv.load(*files, overwrite: overwrite)
+      Dotenv.load(*files.map { |file| root.join(file).to_s }, overwrite: overwrite)
     end
 
     def overload
       deprecator.warn("Dotenv::Rails.overload is deprecated. Set `Dotenv::Rails.overwrite = true` and call Dotenv::Rails.load instead.")
-      Dotenv.load(*files, overwrite: true)
+      Dotenv.load(*files.map { |file| root.join(file).to_s }, overwrite: true)
     end
 
     # Internal: `Rails.root` is nil in Rails 4.1 before the application is

spec/dotenv/rails_spec.rb

@@ -47,10 +47,10 @@
 
       expect(Dotenv::Rails.files).to eql(
         [
-          application.root.join(".env.development.local"),
-          application.root.join(".env.local"),
-          application.root.join(".env.development"),
-          application.root.join(".env")
+          ".env.development.local",
+          ".env.local",
+          ".env.development",
+          ".env"
         ]
       )
     end
@@ -59,22 +59,16 @@
       Rails.env = "test"
       expect(Dotenv::Rails.files).to eql(
         [
-          application.root.join(".env.test.local"),
-          application.root.join(".env.test"),
-          application.root.join(".env")
+          ".env.test.local",
+          ".env.test",
+          ".env"
         ]
       )
     end
 
-    it "returns the relatives paths to Rails.root" do
-      expect(Dotenv::Rails.files.last).to eql(fixture_path(".env"))
-      allow(Rails).to receive(:root).and_return(Pathname.new("/tmp"))
-      expect(Dotenv::Rails.files.last.to_s).to eql("/tmp/.env")
-    end
-
-    it "returns absolute paths unchanged" do
-      Dotenv::Rails.files = ["/tmp/.env"]
-      expect(Dotenv::Rails.files).to eql([Pathname.new("/tmp/.env")])
+    it "can be modified in place" do
+      Dotenv::Rails.files << ".env.shared"
+      expect(Dotenv::Rails.files.last).to eq(".env.shared")
     end
   end
 
@@ -110,6 +104,19 @@
       expect { subject }.to change { ENV["PLAIN"] }.from(nil).to("true")
     end
 
+    it "loads file relative to Rails.root" do
+      allow(Rails).to receive(:root).and_return(Pathname.new("/tmp"))
+      Dotenv::Rails.files = [".env"]
+      expect(Dotenv).to receive(:load).with("/tmp/.env", {overwrite: false})
+      subject
+    end
+
+    it "returns absolute paths unchanged" do
+      Dotenv::Rails.files = ["/tmp/.env"]
+      expect(Dotenv).to receive(:load).with("/tmp/.env", {overwrite: false})
+      subject
+    end
+
     context "with overwrite = true" do
       before { Dotenv::Rails.overwrite = true }