attempt to add pg_search

this commit is an attempt at building a search functionality using only
the stuff provided by postgresql

it is, unfortunately, painfully slow:

    PgSearch::Document Load (7869.1ms)  SELECT "pg_search_documents".* FROM "pg_search_documents" INNER JOIN (SELECT "pg_search_documents"."id" AS pg_search_id, (ts_rank((to_tsvector('simple', coalesce("pg_search_documents"."content"::text, ''))), (to_tsquery('simple', ''' ' || 'awoo' || ' ''')), 0)) AS rank FROM "pg_search_documents" WHERE ((to_tsvector('simple', coalesce("pg_search_documents"."content"::text, ''))) @@ (to_tsquery('simple', ''' ' || 'awoo' || ' ''')))) AS pg_search_ce9b9dd18c5c0023f2116f ON "pg_search_documents"."id" = pg_search_ce9b9dd18c5c0023f2116f.pg_search_id ORDER BY pg_search_ce9b9dd18c5c0023f2116f.rank DESC, "pg_search_documents"."id" ASC LIMIT $1  [["LIMIT", 10]]

Gemfile

@@ -118,3 +118,5 @@ gem "openssl", "~> 3.2"
 gem "mail", "~> 2.7.1"
 
 gem "prometheus-client", "~> 4.2"
+
+gem "pg_search", "~> 2.3"

Gemfile.lock

@@ -289,6 +289,9 @@ GEM
       ast (~> 2.4.1)
       racc
     pg (1.5.4)
+    pg_search (2.3.6)
+      activerecord (>= 5.2)
+      activesupport (>= 5.2)
     pghero (3.3.4)
       activerecord (>= 6)
     prometheus-client (4.2.1)
@@ -542,6 +545,7 @@ DEPENDENCIES
   oj
   openssl (~> 3.2)
   pg
+  pg_search (~> 2.3)
   pghero
   prometheus-client (~> 4.2)
   puma

app/assets/stylesheets/search.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the search controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: https://sass-lang.com/

app/controllers/search_controller.rb

@@ -0,0 +1,9 @@
+class SearchController < ApplicationController
+  def index
+    @results = []
+    query = params[:q]
+    return if query.blank?
+
+    @results = PgSearch.multisearch(query).limit(10)
+  end
+end

app/helpers/search_helper.rb

@@ -0,0 +1,2 @@
+module SearchHelper
+end

app/models/answer.rb

@@ -1,6 +1,9 @@
 class Answer < ApplicationRecord
   extend Answer::TimelineMethods
 
+  include PgSearch::Model
+  multisearchable against: [:content]
+
   belongs_to :user, counter_cache: :answered_count
   belongs_to :question, counter_cache: :answer_count
   has_many :comments, dependent: :destroy

app/models/question.rb

@@ -1,6 +1,9 @@
 class Question < ApplicationRecord
   include Question::AnswerMethods
 
+  include PgSearch::Model
+  multisearchable against: [:content]
+
   belongs_to :user, optional: true
   has_many :answers, dependent: :destroy
   has_many :inboxes, dependent: :destroy

app/views/search/index.haml

@@ -0,0 +1,23 @@
+.container-lg.container--main
+  .row
+    .col-sm-10.col-md-10.col-lg-9.mx-auto
+      .card
+        .card-body
+          = bootstrap_form_tag layout: :inline, method: :get do |f|
+            = f.text_field :q, skip_label: true, append: f.primary("Search")
+  - unless @results.blank?
+    .container-lg.container--main
+      .row
+        .col-sm-10.col-md-10.col-lg-9.mx-auto
+          - @results.each do |result|
+            - case result.searchable
+              - when Answer
+                = render "answerbox", a: result.searchable, display_all: false, subscribed_answer_ids: []
+              - when Question
+                = render "shared/question", q: result.searchable, type: nil
+
+= render 'shared/links'
+
+:ruby
+  provide(:title, generate_title('Search'))
+  parent_layout 'base'

config/routes.rb

@@ -148,6 +148,8 @@ Rails.application.routes.draw do
   post "/inbox/create", to: "inbox#create", as: :inbox_create
   get "/inbox", to: "inbox#show", as: :inbox
 
+  get "/search", to: "search#index"
+
   get "/user/:username", to: "user#show"
   get "/@:username", to: "user#show", as: :user
   get "/@:username/a/:id", to: "answer#show", as: :answer

db/migrate/20231022155815_create_pg_search_documents.rb

@@ -0,0 +1,17 @@
+class CreatePgSearchDocuments < ActiveRecord::Migration[6.1]
+  def up
+    say_with_time("Creating table for pg_search multisearch") do
+      create_table :pg_search_documents do |t|
+        t.text :content
+        t.belongs_to :searchable, polymorphic: true, index: true
+        t.timestamps null: false
+      end
+    end
+  end
+
+  def down
+    say_with_time("Dropping table for pg_search multisearch") do
+      drop_table :pg_search_documents
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2023_10_18_172518) do
+ActiveRecord::Schema.define(version: 2023_10_22_155815) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -127,6 +127,15 @@ ActiveRecord::Schema.define(version: 2023_10_18_172518) do
     t.index ["type"], name: "index_notifications_on_type"
   end
 
+  create_table "pg_search_documents", force: :cascade do |t|
+    t.text "content"
+    t.string "searchable_type"
+    t.bigint "searchable_id"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["searchable_type", "searchable_id"], name: "index_pg_search_documents_on_searchable"
+  end
+
   create_table "profiles", force: :cascade do |t|
     t.bigint "user_id"
     t.string "display_name"
@@ -388,5 +397,6 @@ ActiveRecord::Schema.define(version: 2023_10_18_172518) do
     t.index ["user_id"], name: "index_web_push_subscriptions_on_user_id"
   end
 
+  add_foreign_key "anonymous_blocks", "users", column: "target_user_id"
   add_foreign_key "profiles", "users"
 end

spec/helpers/search_helper_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+# Specs in this file have access to a helper object that includes
+# the SearchHelper. For example:
+#
+# describe SearchHelper do
+#   describe "string concat" do
+#     it "concats two strings with spaces" do
+#       expect(helper.concat_strings("this","that")).to eq("this that")
+#     end
+#   end
+# end
+RSpec.describe SearchHelper, type: :helper do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/requests/search_spec.rb

@@ -0,0 +1,11 @@
+require 'rails_helper'
+
+RSpec.describe "Searches", type: :request do
+  describe "GET /index" do
+    it "returns http success" do
+      get "/search/index"
+      expect(response).to have_http_status(:success)
+    end
+  end
+
+end

spec/views/search/index.html.erb_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe "search/index.html.erb", type: :view do
+  pending "add some examples to (or delete) #{__FILE__}"
+end