about summary refs log tree commit diff
path: root/app/models/tag.rb
blob: 1364d1dba685091c189bf2bf03ea666e14714bf2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
# frozen_string_literal: true
# == Schema Information
#
# Table name: tags
#
#  id                  :bigint(8)        not null, primary key
#  name                :string           default(""), not null
#  created_at          :datetime         not null
#  updated_at          :datetime         not null
#  score               :integer
#  usable              :boolean
#  trendable           :boolean
#  listable            :boolean
#  reviewed_at         :datetime
#  requested_review_at :datetime
#

class Tag < ApplicationRecord
  has_and_belongs_to_many :statuses
  has_and_belongs_to_many :accounts
  has_and_belongs_to_many :sample_accounts, -> { searchable.discoverable.popular.limit(3) }, class_name: 'Account'

  has_many :featured_tags, dependent: :destroy, inverse_of: :tag
  has_one :account_tag_stat, dependent: :destroy

  HASHTAG_NAME_RE = '([[:word:]_][[:word:]_·]*[[:alpha:]_·][[:word:]_·]*[[:word:]_])|([[:word:]_]*[[:alpha:]][[:word:]_]*)'
  HASHTAG_RE = /(?:^|[^\/\)\w])#(#{HASHTAG_NAME_RE})/i

  validates :name, presence: true, format: { with: /\A(#{HASHTAG_NAME_RE})\z/i }
  validate :validate_name_change, if: -> { !new_record? && name_changed? }

  scope :reviewed, -> { where.not(reviewed_at: nil) }
  scope :unreviewed, -> { where(reviewed_at: nil) }
  scope :pending_review, -> { unreviewed.where.not(requested_review_at: nil) }
  scope :usable, -> { where(usable: [true, nil]) }
  scope :discoverable, -> { where(listable: [true, nil]).joins(:account_tag_stat).where(AccountTagStat.arel_table[:accounts_count].gt(0)).order(Arel.sql('account_tag_stats.accounts_count desc')) }
  scope :most_used, ->(account) { joins(:statuses).where(statuses: { account: account }).group(:id).order(Arel.sql('count(*) desc')) }

  delegate :accounts_count,
           :accounts_count=,
           :increment_count!,
           :decrement_count!,
           to: :account_tag_stat

  after_save :save_account_tag_stat

  def account_tag_stat
    super || build_account_tag_stat
  end

  def cached_sample_accounts
    Rails.cache.fetch("#{cache_key}/sample_accounts", expires_in: 12.hours) { sample_accounts }
  end

  def to_param
    name
  end

  def usable
    boolean_with_default('usable', true)
  end

  alias usable? usable

  def listable
    boolean_with_default('listable', true)
  end

  alias listable? listable

  def trendable
    boolean_with_default('trendable', false)
  end

  alias trendable? trendable

  def requires_review?
    reviewed_at.nil?
  end

  def reviewed?
    reviewed_at.present?
  end

  def requested_review?
    requested_review_at.present?
  end

  def trending?
    TrendingTags.trending?(self)
  end

  def history
    days = []

    7.times do |i|
      day = i.days.ago.beginning_of_day.to_i

      days << {
        day: day.to_s,
        uses: Redis.current.get("activity:tags:#{id}:#{day}") || '0',
        accounts: Redis.current.pfcount("activity:tags:#{id}:#{day}:accounts").to_s,
      }
    end

    days
  end

  class << self
    def find_or_create_by_names(name_or_names)
      Array(name_or_names).map(&method(:normalize)).uniq { |str| str.mb_chars.downcase.to_s }.map do |normalized_name|
        tag = matching_name(normalized_name).first || create(name: normalized_name)

        yield tag if block_given?

        tag
      end
    end

    def search_for(term, limit = 5, offset = 0)
      normalized_term = normalize(term.strip).mb_chars.downcase.to_s
      pattern         = sanitize_sql_like(normalized_term) + '%'

      Tag.where(arel_table[:name].lower.matches(pattern))
         .where(arel_table[:score].gt(0).or(arel_table[:name].lower.eq(normalized_term)))
         .order(Arel.sql('length(name) ASC, score DESC, name ASC'))
         .limit(limit)
         .offset(offset)
    end

    def find_normalized(name)
      matching_name(name).first
    end

    def find_normalized!(name)
      find_normalized(name) || raise(ActiveRecord::RecordNotFound)
    end

    def matching_name(name_or_names)
      names = Array(name_or_names).map { |name| normalize(name).mb_chars.downcase.to_s }

      if names.size == 1
        where(arel_table[:name].lower.eq(names.first))
      else
        where(arel_table[:name].lower.in(names))
      end
    end

    private

    def normalize(str)
      str.gsub(/\A#/, '')
    end
  end

  private

  def save_account_tag_stat
    return unless account_tag_stat&.changed?
    account_tag_stat.save
  end

  def validate_name_change
    errors.add(:name, I18n.t('tags.does_not_match_previous_name')) unless name_was.mb_chars.casecmp(name.mb_chars).zero?
  end
end