Add spec described in activerecord-hackery#1153.

spec/ransack/indirect_association_spec.rb

@@ -0,0 +1,29 @@
+require 'spec_helper'
+
+module Ransack
+  describe Search do
+    describe '#ransack' do
+      context 'parameters provided in a harmonious order' do
+        it 'produces the expected result' do
+          result = ProviderCalendar.
+                  ransack({ "account_email_cont" => "account1", "user_email_eq" => "[email protected]" }).
+                  result.
+                  map(&:provider_id)
+
+          expect(result).to eq(["[email protected]", "[email protected]"])
+        end
+      end
+
+      context 'parameters provided in a disharmonious order' do
+        it 'produces the expected result' do
+          result = ProviderCalendar.
+                   ransack({ "user_email_eq" => "[email protected]", "account_email_cont" => "account1" }).
+                   result.
+                   map(&:provider_id)
+
+          expect(result).to eq(["[email protected]", "[email protected]"])
+        end
+      end
+    end
+  end
+end

spec/support/schema.rb

@@ -178,6 +178,34 @@ class Note < ActiveRecord::Base
   belongs_to :notable, polymorphic: true
 end
 
+class User < ActiveRecord::Base
+  has_many :accounts,
+           class_name: "ProviderAccount"
+  has_many :contacts,
+           class_name: "ProviderContact",
+           through:    :accounts,
+           source:     :contacts
+  has_many :calendars,
+           class_name: "ProviderCalendar",
+           through:    :accounts,
+           source:     :calendars
+end
+
+class ProviderAccount < ActiveRecord::Base
+  belongs_to :user
+
+  has_many :calendars, class_name: "ProviderCalendar"
+end
+
+class ProviderCalendar < ActiveRecord::Base
+  belongs_to :account,
+             class_name:  "ProviderAccount",
+             foreign_key: "provider_account_id",
+             inverse_of:  :calendars
+
+  has_one :user, through: :account
+end
+
 module Schema
   def self.create
     ActiveRecord::Migration.verbose = false
@@ -236,6 +264,25 @@ def self.create
         t.integer  :target_person_id
         t.integer  :article_id
       end
+
+      create_table "users", force: :cascade do |t|
+        t.string "email", default: "", null: false
+        t.index ["email"], name: "idx_users_on_email", unique: true
+      end
+
+      create_table "provider_accounts", force: :cascade do |t|
+        t.bigint "user_id", null: false
+        t.string "email", null: false
+        t.index ["email"], name: "idx_p_accounts_on_email"
+        t.index ["user_id"], name: "idx_p_accounts_on_user_id"
+      end
+
+      create_table "provider_calendars", force: :cascade do |t|
+        t.bigint "provider_account_id", null: false
+        t.string "provider_id", null: false
+        t.index ["provider_account_id", "provider_id"], name: "idx_p_calendars_on_p_account_id_and_p_id", unique: true
+        t.index ["provider_account_id"], name: "idx_p_calendars_on_p_account_id"
+      end
     end
 
     10.times do
@@ -257,6 +304,21 @@ def self.create
       body: 'First post!',
       article: Article.make(title: 'Hello, world!')
     )
+
+    user1 = User.create!(email: "[email protected]")
+    user2 = User.create!(email: "[email protected]")
+    user1_acct1 = ProviderAccount.create!(user: user1, email: "[email protected]")
+    user1_acct2 = ProviderAccount.create!(user: user1, email: "[email protected]")
+    user2_acct1 = ProviderAccount.create!(user: user2, email: "[email protected]")
+    user2_acct2 = ProviderAccount.create!(user: user2, email: "[email protected]")
+    ProviderCalendar.create!(account: user1_acct1, provider_id: "[email protected]")
+    ProviderCalendar.create!(account: user1_acct1, provider_id: "[email protected]")
+    ProviderCalendar.create!(account: user1_acct2, provider_id: "[email protected]")
+    ProviderCalendar.create!(account: user1_acct2, provider_id: "[email protected]")
+    ProviderCalendar.create!(account: user2_acct1, provider_id: "[email protected]")
+    ProviderCalendar.create!(account: user2_acct1, provider_id: "[email protected]")
+    ProviderCalendar.create!(account: user2_acct2, provider_id: "[email protected]")
+    ProviderCalendar.create!(account: user2_acct2, provider_id: "[email protected]")
   end
 end