feat: add inertia_config to override global config in controllers

Author: ElMassimo

lib/inertia_rails/configuration.rb

@@ -16,16 +16,22 @@ class Configuration
 
     OPTION_NAMES = DEFAULTS.keys.freeze
 
+    protected attr_reader :controller
     protected attr_reader :options
 
-    def initialize(**attrs)
+    def initialize(controller: nil, **attrs)
+      @controller = controller
       @options = attrs.extract!(*OPTION_NAMES)
 
       unless attrs.empty?
         raise ArgumentError, "Unknown options for #{self.class}: #{attrs.keys}"
       end
     end
 
+    def bind_controller(controller)
+      Configuration.new(**@options, controller: controller)
+    end
+
     def to_h
       @options.to_h
     end
@@ -36,8 +42,7 @@ def merge(config)
 
     OPTION_NAMES.each do |option|
       define_method(option) {
-        value = @options[option]
-        value.respond_to?(:call) ? value.call : value
+        evaluate_option @options[option]
       }
       define_method("#{option}=") { |value|
         @options[option] = value
@@ -47,5 +52,13 @@ def merge(config)
     def self.default
       new(**DEFAULTS)
     end
+
+  private
+
+    def evaluate_option(value)
+      return value unless value.respond_to?(:call)
+      return value.call unless controller
+      controller.instance_exec(&value)
+    end
   end
 end

lib/inertia_rails/controller.rb

@@ -23,12 +23,27 @@ def inertia_share(**args, &block)
         end
       end
 
+      def inertia_config(**attrs)
+        config = InertiaRails::Configuration.new(**attrs)
+
+        if @inertia_configuration
+          @inertia_configuration.merge!(config)
+        else
+          @inertia_configuration = config
+        end
+      end
+
       def use_inertia_instance_props
         before_action do
           @_inertia_instance_props = true
           @_inertia_skip_props = view_assigns.keys + ['_inertia_skip_props']
         end
       end
+
+      def _inertia_configuration
+        config = superclass.try(:_inertia_configuration) || ::InertiaRails.configuration
+        @inertia_configuration ? config.merge(@inertia_configuration) : config
+      end
     end
 
     def default_render
@@ -61,7 +76,7 @@ def inertia_view_assigns
     end
 
     def inertia_configuration
-      ::InertiaRails.configuration
+      self.class._inertia_configuration.bind_controller(self)
     end
 
     def inertia_shared_data

spec/dummy/app/controllers/inertia_config_test_controller.rb

@@ -0,0 +1,14 @@
+class InertiaConfigTestController < ApplicationController
+  inertia_config(
+    ssr_enabled: true,
+    deep_merge_shared_data: true,
+    ssr_enabled: true,
+    ssr_url: "http://localhost:7777",
+    layout: "test",
+    version: "2.0",
+  )
+
+  def configuration
+    render json: inertia_configuration.to_h
+  end
+end

spec/dummy/app/controllers/inertia_rails_mimic_controller.rb

@@ -1,5 +1,7 @@
 class InertiaRailsMimicController < ApplicationController
-  before_action :enable_inertia_default, only: :default_render_test
+  inertia_config(
+    default_render: -> { action_name == "default_render_test" },
+  )
   use_inertia_instance_props
 
   def instance_props_test
@@ -24,10 +26,4 @@ def provided_props_test
   def default_component_test
     render inertia: true
   end
-
-  def enable_inertia_default
-    InertiaRails.configure do |config|
-      config.default_render = true
-    end
-  end
 end

spec/dummy/config/routes.rb

@@ -1,6 +1,7 @@
 Rails.application.routes.draw do
   mount InertiaRails::Engine => "/inertia-rails"
 
+  get 'configuration' => 'inertia_config_test#configuration'
   get 'props' => 'inertia_render_test#props'
   get 'view_data' => 'inertia_render_test#view_data'
   get 'component' => 'inertia_render_test#component'

spec/inertia/configuration_spec.rb

@@ -1,6 +1,21 @@
 RSpec.describe 'Inertia configuration', type: :request do
   after { reset_config! }
 
+  describe 'inertia_config' do
+    it 'overrides the global values' do
+      get configuration_path
+
+      expect(response.parsed_body.symbolize_keys).to eq(
+        deep_merge_shared_data: true,
+        default_render: false,
+        layout: "test",
+        ssr_enabled: true,
+        ssr_url: "http://localhost:7777",
+        version: "2.0",
+      )
+    end
+  end
+
   describe '.version' do
     subject { JSON.parse(response.body)['version'] }