Refactor raw SQL queries to use Arel

spec/lib/account_search_query_builder_spec.rb

@@ -0,0 +1,101 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe AccountSearchQueryBuilder do
+  before do
+    Fabricate(
+      :account,
+      display_name: "Missing",
+      username: "missing",
+      domain: "missing.com"
+    )
+  end
+
+  context 'without account' do
+    it 'accepts ?, \, : and space as delimiter' do
+      needle = Fabricate(
+        :account,
+        display_name: 'A & l & i & c & e',
+        username: 'username',
+        domain: 'example.com'
+      )
+
+      results = described_class.new('A?l\i:c e').build.to_a
+      expect(results).to eq [needle]
+    end
+
+    it 'finds accounts with matching display_name' do
+      needle = Fabricate(
+        :account,
+        display_name: "Display Name",
+        username: "username",
+        domain: "example.com"
+      )
+
+      results = described_class.new("display").build.to_a
+      expect(results).to eq [needle]
+    end
+
+    it 'finds accounts with matching username' do
+      needle = Fabricate(
+        :account,
+        display_name: "Display Name",
+        username: "username",
+        domain: "example.com"
+      )
+
+      results = described_class.new("username").build.to_a
+      expect(results).to eq [needle]
+    end
+
+    it 'finds accounts with matching domain' do
+      needle = Fabricate(
+        :account,
+        display_name: "Display Name",
+        username: "username",
+        domain: "example.com"
+      )
+
+      results = described_class.new("example").build.to_a
+      expect(results).to eq [needle]
+    end
+
+    it 'limits by 10 by default' do
+      11.times.each { Fabricate(:account, display_name: "Display Name") }
+      results = described_class.new("display").build.to_a
+      expect(results.size).to eq 10
+    end
+
+    it 'accepts arbitrary limits' do
+      2.times.each { Fabricate(:account, display_name: "Display Name") }
+      results = described_class.new("display", limit: 1).build.to_a
+      expect(results.size).to eq 1
+    end
+
+    it 'ranks multiple matches higher' do
+      needles = [
+        { username: "username", display_name: "username" },
+        { display_name: "Display Name", username: "username", domain: "example.com" },
+      ].map(&method(:Fabricate).curry(2).call(:account))
+
+      results = described_class.new("username").build.to_a
+      expect(results).to eq needles
+    end
+  end
+
+  context 'with account' do
+    let(:account) { Fabricate(:account) }
+
+    it 'ranks followed accounts higher' do
+      needle = Fabricate(:account, username: "Matching")
+      followed_needle = Fabricate(:account, username: "Matcher")
+      account.follow!(followed_needle)
+
+      results = described_class.new("match", account: account).build.to_a
+
+      expect(results).to eq [followed_needle, needle]
+      expect(results.first.rank).to be > results.last.rank
+    end
+  end
+end