Feature/better error for missing resource

app/controllers/avo/application_controller.rb

@@ -125,6 +125,8 @@ def detect_fields
     end
 
     def set_related_resource
+      raise Avo::MissingResourceError.new(related_resource_name) if related_resource.nil?
+
       @related_resource = related_resource.new(params: params, view: action_name.to_sym, user: _current_user, record: @related_record).detect_fields
     end
 

db/factories.rb

@@ -129,4 +129,23 @@
     status { "status" }
     category { ::Product.categories.values.sample }
   end
+
+  factory :location do
+    team { create :team }
+    name { Faker::Address.street_name }
+    address { Faker::Address.full_address }
+    size { ["small", "medium", "large"].sample }
+  end
+
+  factory :event do
+    location { create :location }
+    name { Faker::Lorem.sentence }
+    event_time { DateTime.now }
+    body { Faker::Lorem.paragraphs(number: rand(1...3)).join("\n") }
+  end
+
+  factory :store do
+    name { Faker::Company.name }
+    size { ["small", "medium", "large"].sample }
+  end
 end

lib/avo.rb

@@ -31,6 +31,24 @@ class MissingGemError < StandardError; end
 
   class DeprecatedAPIError < StandardError; end
 
+  class MissingResourceError < StandardError
+    def initialize(resource_name)
+      super(missing_resource_message(resource_name))
+    end
+
+    private
+
+    def missing_resource_message(resource_name)
+      name = resource_name.to_s.downcase
+
+      "Failed to find a resource while rendering the :#{name} field.\n" \
+      "You may generate a resource for it by running 'rails generate avo:resource #{name.singularize}'.\n" \
+      "\n" \
+      "Alternatively add the 'use_resource' option to the :#{name} field to specify a custom resource to be used.\n" \
+      "More info on https://docs.avohq.io/#{Avo::VERSION[0]}.0/resources.html."
+    end
+  end
+
   class << self
     attr_reader :logger
     attr_reader :cache_store

lib/avo/fields/base_field.rb

@@ -289,6 +289,12 @@ def on_create?
       def in_action?
         @action.present?
       end
+
+      def get_resource_by_model_class(model_class)
+        resource = Avo.resource_manager.get_resource_by_model_class(model_class)
+
+        resource || (raise Avo::MissingResourceError.new(model_class))
+      end
     end
   end
 end

lib/avo/fields/belongs_to_field.rb

@@ -234,7 +234,7 @@ def target_resource
 
         if is_polymorphic?
           if value.present?
-            return Avo.resource_manager.get_resource_by_model_class(value.class)
+            return get_resource_by_model_class(value.class)
           else
             return nil
           end
@@ -243,9 +243,9 @@ def target_resource
         reflection_key = polymorphic_as || id
 
         if @record._reflections[reflection_key.to_s].klass.present?
-          Avo.resource_manager.get_resource_by_model_class @record._reflections[reflection_key.to_s].klass.to_s
+          get_resource_by_model_class(@record._reflections[reflection_key.to_s].klass.to_s)
         elsif @record._reflections[reflection_key.to_s].options[:class_name].present?
-          Avo.resource_manager.get_resource_by_model_class @record._reflections[reflection_key.to_s].options[:class_name]
+          get_resource_by_model_class(@record._reflections[reflection_key.to_s].options[:class_name])
         else
           App.get_resource_by_name reflection_key.to_s
         end

lib/avo/fields/has_base_field.rb

@@ -27,7 +27,7 @@ def initialize(id, **args, &block)
       end
 
       def field_resource
-        resource || Avo.resource_manager.get_resource_by_model_class(@record.class)
+        resource || get_resource_by_model_class(@record.class)
       end
 
       def turbo_frame
@@ -57,9 +57,9 @@ def field_label
 
       def target_resource
         if @record._reflections[id.to_s].klass.present?
-          Avo.resource_manager.get_resource_by_model_class @record._reflections[id.to_s].klass.to_s
+          get_resource_by_model_class(@record._reflections[id.to_s].klass.to_s)
         elsif @record._reflections[id.to_s].options[:class_name].present?
-          Avo.resource_manager.get_resource_by_model_class @record._reflections[id.to_s].options[:class_name]
+          get_resource_by_model_class(@record._reflections[id.to_s].options[:class_name])
         else
           Avo.resource_manager.get_resource_by_name id.to_s
         end

spec/dummy/app/avo/resources/course.rb

@@ -73,6 +73,11 @@ def fields
 
     field :links, as: :has_many, searchable: true, placeholder: "Click to choose a link",
       discreet_pagination: true
+
+    if params[:show_location_field] == '1'
+      # Example for error message when resource is missing
+      field :locations, as: :has_and_belongs_to_many
+    end
   end
 
   def filters

spec/dummy/app/avo/resources/event.rb

@@ -0,0 +1,15 @@
+class Avo::Resources::Event < Avo::BaseResource
+  self.title = :name
+  self.description = "An event that happened at a certain time."
+  self.includes = [:location]
+
+  def fields
+    field :name, as: :text, link_to_record: true, sortable: true, stacked: true
+    field :event_time, as: :datetime, sortable: true
+
+    if params[:show_location_field] == '1'
+      # Example for error message when resource is missing
+      field :location, as: :belongs_to
+    end
+  end
+end

spec/dummy/app/avo/resources/store.rb

@@ -0,0 +1,14 @@
+class Avo::Resources::Store < Avo::BaseResource
+  self.includes = [:location]
+
+  def fields
+    field :id, as: :id
+    field :name, as: :text
+    field :size, as: :text
+
+    if params[:show_location_field] == '1'
+      # Example for error message when resource is missing
+      field :location, as: :has_one
+    end
+  end
+end

spec/dummy/app/avo/resources/team.rb

@@ -1,5 +1,5 @@
 class Avo::Resources::Team < Avo::BaseResource
-  self.includes = [:admin, :team_members]
+  self.includes = [:admin, :team_members, :locations]
   self.search = {
     query: -> { query.ransack(id_eq: params[:q], name_cont: params[:q], m: "or").result(distinct: false) }
   }
@@ -79,6 +79,11 @@ def fields
     field :admin, as: :has_one
     field :team_members, as: :has_many, through: :memberships, translation_key: "avo.resource_translations.team_members"
     field :reviews, as: :has_many
+
+    if params[:show_location_field] == '1'
+      # Example for error message when resource is missing
+      field :locations, as: :has_many
+    end
   end
 
   def filters

spec/dummy/app/controllers/avo/events_controller.rb

@@ -0,0 +1,2 @@
+class Avo::EventsController < Avo::ResourcesController
+end

spec/dummy/app/controllers/avo/stores_controller.rb

@@ -0,0 +1,2 @@
+class Avo::StoresController < Avo::ResourcesController
+end

spec/dummy/app/models/city.rb

@@ -9,13 +9,12 @@
 #  features         :json
 #  metadata         :json
 #  image_url        :string
-#  description      :text
 #  status           :string
 #  tiny_description :text
 #  created_at       :datetime         not null
 #  updated_at       :datetime         not null
-#  latitude         :float
 #  longitude        :float
+#  latitude         :float
 #  city_center_area :json
 #
 class City < ApplicationRecord

spec/dummy/app/models/course.rb

@@ -16,6 +16,8 @@ class Course < ApplicationRecord
 
   has_many :links, -> { order(position: :asc) }, class_name: "Course::Link", inverse_of: :course
 
+  has_and_belongs_to_many :locations, inverse_of: :courses
+
   validates :name, presence: true
 
   def has_skills

spec/dummy/app/models/event.rb

@@ -2,12 +2,16 @@
 #
 # Table name: events
 #
-#  id         :bigint           not null, primary key
-#  name       :string
-#  event_time :datetime
-#  created_at :datetime         not null
-#  updated_at :datetime         not null
+#  id          :bigint           not null, primary key
+#  name        :string
+#  event_time  :datetime
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#  body        :text
+#  location_id :bigint
 #
 class Event < ApplicationRecord
   has_rich_text :body
+
+  belongs_to :location, optional: true
 end

spec/dummy/app/models/location.rb

@@ -0,0 +1,19 @@
+# == Schema Information
+#
+# Table name: locations
+#
+#  id         :bigint           not null, primary key
+#  team_id    :bigint           not null
+#  name       :text
+#  address    :string
+#  size       :string
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  store_id   :bigint
+#
+class Location < ApplicationRecord
+  belongs_to :store, optional: true
+  belongs_to :team, optional: true
+
+  has_and_belongs_to_many :courses, inverse_of: :locations
+end

spec/dummy/app/models/store.rb

@@ -0,0 +1,13 @@
+# == Schema Information
+#
+# Table name: stores
+#
+#  id         :bigint           not null, primary key
+#  name       :string
+#  size       :string
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+class Store < ApplicationRecord
+  has_one :location
+end

spec/dummy/app/models/team.rb

@@ -15,6 +15,7 @@ class Team < ApplicationRecord
 
   has_many :memberships, class_name: "TeamMembership"
   has_many :team_members, through: :memberships, class_name: "User", source: :user, inverse_of: :teams
+  has_many :locations
 
   has_one :admin_membership, -> { where level: :admin }, class_name: "TeamMembership", dependent: :destroy
   has_one :admin, through: :admin_membership, source: :user, inverse_of: :teams

spec/dummy/config/initializers/avo.rb

@@ -98,10 +98,12 @@
 
       section "Store", icon: "currency-dollar" do
         resource :products
+        resource :stores
       end
 
       group "Other", collapsable: true, collapsed: true do
         resource :fish, label: "Fishies"
+        resource :events
       end
     end
 

spec/dummy/db/migrate/20231126035843_create_locations.rb

@@ -0,0 +1,12 @@
+class CreateLocations < ActiveRecord::Migration[6.1]
+  def change
+    create_table :locations do |t|
+      t.references :team, null: false, foreign_key: true
+      t.text :name
+      t.string :address
+      t.string :size
+
+      t.timestamps
+    end
+  end
+end

spec/dummy/db/migrate/20231205153910_create_courses_locations.rb

@@ -0,0 +1,10 @@
+class CreateCoursesLocations < ActiveRecord::Migration[6.1]
+  def change
+    create_table :courses_locations do |t|
+      t.references :user, null: false, foreign_key: true
+      t.references :course, null: false, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

spec/dummy/db/migrate/20231206095919_add_location_to_events.rb

@@ -0,0 +1,5 @@
+class AddLocationToEvents < ActiveRecord::Migration[6.1]
+  def change
+    add_reference :events, :location, null: true, foreign_key: true
+  end
+end

spec/dummy/db/migrate/20231206112806_create_stores.rb

@@ -0,0 +1,10 @@
+class CreateStores < ActiveRecord::Migration[6.1]
+  def change
+    create_table :stores do |t|
+      t.string :name
+      t.string :size
+
+      t.timestamps
+    end
+  end
+end

spec/dummy/db/migrate/20231206113153_add_store_to_locations.rb

@@ -0,0 +1,5 @@
+class AddStoreToLocations < ActiveRecord::Migration[6.1]
+  def change
+    add_reference :locations, :store, foreign_key: true
+  end
+end

spec/dummy/db/migrate/20231212231204_make_team_id_nullable_on_locations.rb

@@ -0,0 +1,5 @@
+class MakeTeamIdNullableOnLocations < ActiveRecord::Migration[6.1]
+  def change
+    change_column :locations, :team_id, :bigint, null: true
+  end
+end