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discourse/lib/discourse_tagging.rb

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# frozen_string_literal: true
module DiscourseTagging
TAGS_FIELD_NAME ||= "tags"
TAGS_FILTER_REGEXP ||= /[\/\?#\[\]@!\$&'\(\)\*\+,;=\.%\\`^\s|\{\}"<>]+/ # /?#[]@!$&'()*+,;=.%\`^|{}"<>
TAGS_STAFF_CACHE_KEY ||= "staff_tag_names"
TAG_GROUP_TAG_IDS_SQL ||= <<-SQL
SELECT tag_id
FROM tag_group_memberships tgm
INNER JOIN tag_groups tg
ON tgm.tag_group_id = tg.id
SQL
def self.term_types
@term_types ||= Enum.new(contains: 0, starts_with: 1)
end
def self.tag_topic_by_names(topic, guardian, tag_names_arg, append: false)
if guardian.can_tag?(topic)
tag_names = DiscourseTagging.tags_for_saving(tag_names_arg, guardian) || []
if !tag_names.empty?
Tag
.where_name(tag_names)
.joins(:target_tag)
.includes(:target_tag)
.each { |tag| tag_names[tag_names.index(tag.name)] = tag.target_tag.name }
end
# tags currently on the topic
old_tag_names = topic.tags.pluck(:name) || []
# tags we're trying to add to the topic
new_tag_names = tag_names - old_tag_names
# tag names being removed from the topic
removed_tag_names = old_tag_names - tag_names
# tag names which are visible, but not usable, by *some users*
readonly_tags = DiscourseTagging.readonly_tag_names(guardian)
# tags names which are not visible or usable by this user
hidden_tags = DiscourseTagging.hidden_tag_names(guardian)
# tag names which ARE permitted by *this user*
permitted_tags = DiscourseTagging.permitted_tag_names(guardian)
# If this user has explicit permission to use certain tags,
# we need to ensure those tags are removed from the list of
# restricted tags
readonly_tags = readonly_tags - permitted_tags if permitted_tags.present?
# visible, but not usable, tags this user is trying to use
disallowed_tags = new_tag_names & readonly_tags
# hidden tags this user is trying to use
disallowed_tags += new_tag_names & hidden_tags
if disallowed_tags.present?
topic.errors.add(
:base,
I18n.t("tags.restricted_tag_disallowed", tag: disallowed_tags.join(" ")),
)
return false
end
removed_readonly_tags = removed_tag_names & readonly_tags
if removed_readonly_tags.present?
topic.errors.add(
:base,
I18n.t("tags.restricted_tag_remove_disallowed", tag: removed_readonly_tags.join(" ")),
)
return false
end
tag_names += removed_tag_names & hidden_tags
category = topic.category
tag_names = tag_names + old_tag_names if append
if tag_names.present?
# guardian is explicitly nil cause we don't want to strip all
# staff tags that already passed validation
tags =
filter_allowed_tags(
nil, # guardian
for_topic: true,
category: category,
selected_tags: tag_names,
only_tag_names: tag_names,
)
# keep existent tags that current user cannot use
tags += Tag.where(name: old_tag_names & tag_names)
tags = Tag.where(id: tags.map(&:id)).all.to_a if tags.size > 0
if tags.size < tag_names.size &&
(
category.nil? || category.allow_global_tags ||
(category.tags.count == 0 && category.tag_groups.count == 0)
)
tag_names.each do |name|
tags << Tag.create(name: name) unless Tag.where_name(name).exists?
end
end
# tests if there are conflicts between tags on tag groups that only allow one tag from the group before adding
# mandatory parent tags because later we want to test if the mandatory parent tags introduce any conflicts
# and be able to pinpoint the tag that is introducing it
# guardian like above is nil to prevent stripping tags that already passed validation
return false unless validate_one_tag_from_group_per_topic(nil, topic, category, tags)
# add missing mandatory parent tags
tag_ids = tags.map(&:id)
parent_tags_map =
DB
.query(
"
SELECT tgm.tag_id, tg.parent_tag_id
FROM tag_groups tg
INNER JOIN tag_group_memberships tgm
ON tgm.tag_group_id = tg.id
WHERE tg.parent_tag_id IS NOT NULL
AND tgm.tag_id IN (?)
",
tag_ids,
)
.inject({}) do |h, v|
h[v.tag_id] ||= []
h[v.tag_id] << v.parent_tag_id
h
end
missing_parent_tag_ids =
parent_tags_map
.map do |_, parent_tag_ids|
(tag_ids & parent_tag_ids).size == 0 ? parent_tag_ids.first : nil
end
.compact
.uniq
missing_parent_tags = Tag.where(id: missing_parent_tag_ids).all
tags = tags + missing_parent_tags unless missing_parent_tags.empty?
parent_tag_conflicts =
filter_tags_violating_one_tag_from_group_per_topic(
nil, # guardian like above is nil to prevent stripping tags that already passed validation
topic.category,
tags,
)
if parent_tag_conflicts.present?
# we need to get the original tag names that introduced conflicting missing parent tags to return an useful
# error message
parent_child_names_map = {}
parent_tags_map.each do |tag_id, parent_tag_ids|
next if (tag_ids & parent_tag_ids).size > 0 # tag already has a parent tag
parent_tag = tags.select { |t| t.id == parent_tag_ids.first }.first
original_child_tag = tags.select { |t| t.id == tag_id }.first
next unless parent_tag.present? && original_child_tag.present?
parent_child_names_map[parent_tag.name] = original_child_tag.name
end
# replaces the added missing parent tags with the original tag
parent_tag_conflicts.map do |_, conflicting_tags|
topic.errors.add(
:base,
I18n.t(
"tags.limited_to_one_tag_from_group",
tags:
conflicting_tags
.map do |tag|
tag_name = tag.name
if parent_child_names_map[tag_name].present?
parent_child_names_map[tag_name]
else
tag_name
end
end
.uniq
.sort
.join(", "),
),
)
end
return false
end
return false unless validate_min_required_tags_for_category(guardian, topic, category, tags)
return false unless validate_required_tags_from_group(guardian, topic, category, tags)
if tags.size == 0
topic.errors.add(:base, I18n.t("tags.forbidden.invalid", count: new_tag_names.size))
return false
end
topic.tags = tags
else
return false unless validate_min_required_tags_for_category(guardian, topic, category)
return false unless validate_required_tags_from_group(guardian, topic, category)
topic.tags = []
end
topic.tags_changed = true
DiscourseEvent.trigger(
:topic_tags_changed,
topic,
old_tag_names: old_tag_names,
new_tag_names: topic.tags.map(&:name),
)
true
else
topic.errors.add(:base, I18n.t("tags.user_not_permitted"))
false
end
end
def self.validate_category_tags(guardian, model, category, tags = [])
existing_tags = tags.present? ? Tag.where(name: tags) : []
valid_tags = guardian.can_create_tag? ? tags : existing_tags
# all add to model (topic) errors
valid = validate_min_required_tags_for_category(guardian, model, category, valid_tags)
valid &&= validate_required_tags_from_group(guardian, model, category, existing_tags)
valid &&= validate_category_restricted_tags(guardian, model, category, valid_tags)
valid &&= validate_one_tag_from_group_per_topic(guardian, model, category, valid_tags)
valid
end
def self.validate_min_required_tags_for_category(guardian, model, category, tags = [])
if !guardian.is_staff? && category && category.minimum_required_tags > 0 &&
tags.length < category.minimum_required_tags
model.errors.add(
:base,
I18n.t("tags.minimum_required_tags", count: category.minimum_required_tags),
)
false
else
true
end
end
def self.validate_required_tags_from_group(guardian, model, category, tags = [])
return true if guardian.is_staff? || category.nil?
success = true
category.category_required_tag_groups.each do |crtg|
if tags.length < crtg.min_count ||
crtg.tag_group.tags.where("tags.id in (?)", tags.map(&:id)).count < crtg.min_count
success = false
model.errors.add(
:base,
I18n.t(
"tags.required_tags_from_group",
count: crtg.min_count,
tag_group_name: crtg.tag_group.name,
tags: crtg.tag_group.tags.order(:id).pluck(:name).join(", "),
),
)
end
end
success
end
def self.validate_category_restricted_tags(guardian, model, category, tags = [])
return true if tags.blank? || category.blank?
tags = tags.map(&:name) if Tag === tags[0]
tags_restricted_to_categories = Hash.new { |h, k| h[k] = Set.new }
query = Tag.where(name: tags)
query
.joins(tag_groups: :categories)
.pluck(:name, "categories.id")
.each { |(tag, cat_id)| tags_restricted_to_categories[tag] << cat_id }
query
.joins(:categories)
.pluck(:name, "categories.id")
.each { |(tag, cat_id)| tags_restricted_to_categories[tag] << cat_id }
unallowed_tags =
tags_restricted_to_categories.keys.select do |tag|
!tags_restricted_to_categories[tag].include?(category.id)
end
if unallowed_tags.present?
msg =
I18n.t(
"tags.forbidden.restricted_tags_cannot_be_used_in_category",
count: unallowed_tags.size,
tags: unallowed_tags.sort.join(", "),
category: category.name,
)
model.errors.add(:base, msg)
return false
end
if !category.allow_global_tags && category.has_restricted_tags?
unrestricted_tags = tags - tags_restricted_to_categories.keys
if unrestricted_tags.present?
msg =
I18n.t(
"tags.forbidden.category_does_not_allow_tags",
count: unrestricted_tags.size,
tags: unrestricted_tags.sort.join(", "),
category: category.name,
)
model.errors.add(:base, msg)
return false
end
end
true
end
def self.validate_one_tag_from_group_per_topic(guardian, model, category, tags = [])
tags_cant_be_used = filter_tags_violating_one_tag_from_group_per_topic(guardian, category, tags)
return true if tags_cant_be_used.blank?
tags_cant_be_used.each do |_, incompatible_tags|
model.errors.add(
:base,
I18n.t(
"tags.limited_to_one_tag_from_group",
tags: incompatible_tags.map(&:name).sort.join(", "),
),
)
end
false
end
def self.filter_tags_violating_one_tag_from_group_per_topic(guardian, category, tags = [])
return [] if tags.size < 2
# ensures that tags are a list of tag names
tags = tags.map(&:name) if Tag === tags[0]
allowed_tags =
filter_allowed_tags(
guardian,
category: category,
only_tag_names: tags,
for_topic: true,
order_search_results: true,
)
return {} if allowed_tags.size < 2
tags_by_group_map =
allowed_tags
.sort_by { |tag| [tag.tag_group_id || -1, tag.name] }
.inject({}) do |hash, tag|
next hash unless tag.one_per_topic
hash[tag.tag_group_id] = (hash[tag.tag_group_id] || []) << tag
hash
end
tags_by_group_map.select { |_, group_tags| group_tags.size > 1 }
end
TAG_GROUP_RESTRICTIONS_SQL ||= <<~SQL
tag_group_restrictions AS (
SELECT t.id as tag_id, tgm.id as tgm_id, tg.id as tag_group_id, tg.parent_tag_id as parent_tag_id,
tg.one_per_topic as one_per_topic
FROM tags t
LEFT OUTER JOIN tag_group_memberships tgm ON tgm.tag_id = t.id /*and_name_like*/
LEFT OUTER JOIN tag_groups tg ON tg.id = tgm.tag_group_id
)
SQL
CATEGORY_RESTRICTIONS_SQL ||= <<~SQL
category_restrictions AS (
SELECT t.id as tag_id, ct.id as ct_id, ct.category_id as category_id, NULL AS category_tag_group_id
FROM tags t
INNER JOIN category_tags ct ON t.id = ct.tag_id /*and_name_like*/
UNION
SELECT t.id as tag_id, ctg.id as ctg_id, ctg.category_id as category_id, ctg.tag_group_id AS category_tag_group_id
FROM tags t
INNER JOIN tag_group_memberships tgm ON tgm.tag_id = t.id /*and_name_like*/
INNER JOIN category_tag_groups ctg ON tgm.tag_group_id = ctg.tag_group_id
)
SQL
PERMITTED_TAGS_SQL ||= <<~SQL
permitted_tag_groups AS (
SELECT tg.id as tag_group_id, tgp.group_id as group_id, tgp.permission_type as permission_type
FROM tags t
INNER JOIN tag_group_memberships tgm ON tgm.tag_id = t.id /*and_name_like*/
INNER JOIN tag_groups tg ON tg.id = tgm.tag_group_id
INNER JOIN tag_group_permissions tgp
ON tg.id = tgp.tag_group_id /*and_group_ids*/
AND tgp.permission_type = #{TagGroupPermission.permission_types[:full]}
)
SQL
# Options:
# term: a search term to filter tags by name
# term_type: whether to search by "starts_with" or "contains" with the term
# limit: max number of results
# category: a Category to which the object being tagged belongs
# for_input: result is for an input field, so only show permitted tags
# for_topic: results are for tagging a topic
# selected_tags: an array of tag names that are in the current selection
# only_tag_names: limit results to tags with these names
# exclude_synonyms: exclude synonyms from results
# order_search_results: result should be ordered for name search results
# order_popularity: order result by topic_count
# excluded_tag_names: an array of tag names not to include in the results
def self.filter_allowed_tags(guardian, opts = {})
selected_tag_ids = opts[:selected_tags] ? Tag.where_name(opts[:selected_tags]).pluck(:id) : []
category = opts[:category]
category_has_restricted_tags =
category ? (category.tags.count > 0 || category.tag_groups.count > 0) : false
# If guardian is nil, it means the caller doesn't want tags to be filtered
# based on guardian rules. Use the same rules as for staff users.
filter_for_non_staff = !guardian.nil? && !guardian.is_staff?
builder_params = {}
builder_params[:selected_tag_ids] = selected_tag_ids unless selected_tag_ids.empty?
sql = +"WITH #{TAG_GROUP_RESTRICTIONS_SQL}, #{CATEGORY_RESTRICTIONS_SQL}"
if (opts[:for_input] || opts[:for_topic]) && filter_for_non_staff
sql << ", #{PERMITTED_TAGS_SQL} "
builder_params[:group_ids] = permitted_group_ids(guardian)
sql.gsub!("/*and_group_ids*/", "AND group_id IN (:group_ids)")
end
outer_join = category.nil? || category.allow_global_tags || !category_has_restricted_tags
topic_count_column = Tag.topic_count_column(guardian)
distinct_clause =
if opts[:order_popularity]
"DISTINCT ON (#{topic_count_column}, name)"
elsif opts[:order_search_results] && opts[:term].present?
"DISTINCT ON (lower(name) = lower(:cleaned_term), #{topic_count_column}, name)"
else
""
end
sql << <<~SQL
SELECT #{distinct_clause} t.id, t.name, t.#{topic_count_column}, t.pm_topic_count, t.description,
tgr.tgm_id as tgm_id, tgr.tag_group_id as tag_group_id, tgr.parent_tag_id as parent_tag_id,
tgr.one_per_topic as one_per_topic, t.target_tag_id
FROM tags t
INNER JOIN tag_group_restrictions tgr ON tgr.tag_id = t.id
#{outer_join ? "LEFT OUTER" : "INNER"}
JOIN category_restrictions cr ON t.id = cr.tag_id AND (tgr.tag_group_id = cr.category_tag_group_id OR cr.category_tag_group_id IS NULL)
/*where*/
/*order_by*/
/*limit*/
SQL
builder = DB.build(sql)
if !opts[:for_topic] && builder_params[:selected_tag_ids]
builder.where("id NOT IN (:selected_tag_ids)")
end
if opts[:only_tag_names]
builder.where("LOWER(name) IN (:only_tag_names)")
builder_params[:only_tag_names] = opts[:only_tag_names].map(&:downcase)
end
# parent tag requirements
if opts[:for_input]
builder.where(
(
if builder_params[:selected_tag_ids]
"tgm_id IS NULL OR parent_tag_id IS NULL OR parent_tag_id IN (:selected_tag_ids)"
else
"tgm_id IS NULL OR parent_tag_id IS NULL"
end
),
)
end
if category && category_has_restricted_tags
builder.where(
category.allow_global_tags ? "category_id = ? OR category_id IS NULL" : "category_id = ?",
category.id,
)
elsif category || opts[:for_input] || opts[:for_topic]
# tags not restricted to any categories
builder.where("category_id IS NULL")
end
if filter_for_non_staff && (opts[:for_input] || opts[:for_topic])
# exclude staff-only tag groups
builder.where(
"tag_group_id IS NULL OR tag_group_id IN (SELECT tag_group_id FROM permitted_tag_groups)",
)
end
term = opts[:term]
if term.present?
term = term.gsub("_", "\\_").downcase
builder_params[:cleaned_term] = term
if opts[:term_type] == DiscourseTagging.term_types[:starts_with]
builder_params[:term] = "#{term}%"
else
builder_params[:term] = "%#{term}%"
end
builder.where("LOWER(name) LIKE :term")
sql.gsub!("/*and_name_like*/", "AND LOWER(t.name) LIKE :term")
else
sql.gsub!("/*and_name_like*/", "")
end
# show required tags for non-staff
# or for staff when
# - there are more available tags than the query limit
# - and no search term has been included
required_tag_ids = nil
required_category_tag_group = nil
if opts[:for_input] && category&.category_required_tag_groups.present? &&
(filter_for_non_staff || term.blank?)
category.category_required_tag_groups.each do |crtg|
group_tags = crtg.tag_group.tags.pluck(:id)
next if (group_tags & selected_tag_ids).size >= crtg.min_count
if filter_for_non_staff || group_tags.size >= opts[:limit].to_i
required_category_tag_group = crtg
required_tag_ids = group_tags
builder.where("id IN (?)", required_tag_ids)
end
break
end
end
if filter_for_non_staff
group_ids = permitted_group_ids(guardian)
builder.where(<<~SQL, group_ids, group_ids)
id NOT IN (
(SELECT tgm.tag_id
FROM tag_group_permissions tgp
INNER JOIN tag_groups tg ON tgp.tag_group_id = tg.id
INNER JOIN tag_group_memberships tgm ON tg.id = tgm.tag_group_id
WHERE tgp.group_id NOT IN (?))
EXCEPT
(SELECT tgm.tag_id
FROM tag_group_permissions tgp
INNER JOIN tag_groups tg ON tgp.tag_group_id = tg.id
INNER JOIN tag_group_memberships tgm ON tg.id = tgm.tag_group_id
WHERE tgp.group_id IN (?))
)
SQL
end
if builder_params[:selected_tag_ids] && (opts[:for_input] || opts[:for_topic])
one_tag_per_group_ids = DB.query(<<~SQL, builder_params[:selected_tag_ids]).map(&:id)
SELECT DISTINCT(tg.id)
FROM tag_groups tg
INNER JOIN tag_group_memberships tgm ON tg.id = tgm.tag_group_id AND tgm.tag_id IN (?)
WHERE tg.one_per_topic
SQL
if one_tag_per_group_ids.present?
builder.where(
"t.id NOT IN (SELECT DISTINCT tag_id FROM tag_group_restrictions WHERE tag_group_id IN (?)) OR id IN (:selected_tag_ids)",
one_tag_per_group_ids,
)
end
end
builder.where("target_tag_id IS NULL") if opts[:exclude_synonyms]
if opts[:exclude_has_synonyms]
builder.where("id NOT IN (SELECT target_tag_id FROM tags WHERE target_tag_id IS NOT NULL)")
end
builder.where("name NOT IN (?)", opts[:excluded_tag_names]) if opts[:excluded_tag_names]&.any?
if opts[:limit]
if required_tag_ids && term.blank?
# override limit so all required tags are shown by default
builder.limit(required_tag_ids.size)
else
builder.limit(opts[:limit])
end
end
if opts[:order_popularity]
builder.order_by("#{topic_count_column} DESC, name")
elsif opts[:order_search_results] && !term.blank?
builder.order_by("lower(name) = lower(:cleaned_term) DESC, #{topic_count_column} DESC, name")
end
result = builder.query(builder_params).uniq { |t| t.id }
if opts[:with_context]
context = {}
if required_category_tag_group
context[:required_tag_group] = {
name: required_category_tag_group.tag_group.name,
min_count: required_category_tag_group.min_count,
}
end
[result, context]
else
result
end
end
def self.visible_tags(guardian)
if guardian&.is_staff?
Tag.all
else
# Visible tags either have no permissions or have allowable permissions
Tag
.where.not(id: TagGroupMembership.joins(tag_group: :tag_group_permissions).select(:tag_id))
.or(
Tag.where(
id:
TagGroupPermission
.joins(tag_group: :tag_group_memberships)
.where(group_id: permitted_group_ids_query(guardian))
.select("tag_group_memberships.tag_id"),
),
)
end
end
def self.filter_visible(query, guardian = nil)
guardian&.is_staff? ? query : query.where(id: visible_tags(guardian).select(:id))
end
def self.hidden_tag_names(guardian = nil)
guardian&.is_staff? ? [] : Tag.where.not(id: visible_tags(guardian).select(:id)).pluck(:name)
end
def self.permitted_group_ids_query(guardian = nil)
if guardian&.authenticated?
Group.from(
Group.sanitize_sql(
[
"(SELECT ? AS id UNION #{guardian.user.groups.select(:id).to_sql}) as groups",
Group::AUTO_GROUPS[:everyone],
],
),
).select(:id)
else
Group.from(
Group.sanitize_sql(["(SELECT ? AS id) AS groups", Group::AUTO_GROUPS[:everyone]]),
).select(:id)
end
end
def self.permitted_group_ids(guardian = nil)
permitted_group_ids_query(guardian).pluck(:id)
end
# read-only tags for this user
def self.readonly_tag_names(guardian = nil)
return [] if guardian&.is_staff?
query =
Tag.joins(tag_groups: :tag_group_permissions).where(
"tag_group_permissions.permission_type = ?",
TagGroupPermission.permission_types[:readonly],
)
query.pluck(:name)
end
# explicit permissions to use these tags
def self.permitted_tag_names(guardian = nil)
query =
Tag.joins(tag_groups: :tag_group_permissions).where(
tag_group_permissions: {
group_id: permitted_group_ids(guardian),
permission_type: TagGroupPermission.permission_types[:full],
},
)
query.pluck(:name).uniq
end
# middle level of tag group restrictions
def self.staff_tag_names
tag_names = Discourse.cache.read(TAGS_STAFF_CACHE_KEY)
if !tag_names
tag_names =
Tag
.joins(tag_groups: :tag_group_permissions)
.where(
tag_group_permissions: {
group_id: Group::AUTO_GROUPS[:everyone],
permission_type: TagGroupPermission.permission_types[:readonly],
},
)
.pluck(:name)
Discourse.cache.write(TAGS_STAFF_CACHE_KEY, tag_names, expires_in: 1.hour)
end
tag_names
end
def self.clear_cache!
Discourse.cache.delete(TAGS_STAFF_CACHE_KEY)
end
def self.clean_tag(tag)
tag = tag.dup
tag.downcase! if SiteSetting.force_lowercase_tags
tag.strip!
tag.gsub!(/[[:space:]]+/, "-")
tag.gsub!(/[^[:word:][:punct:]]+/, "")
tag.gsub!(TAGS_FILTER_REGEXP, "")
tag.squeeze!("-")
tag[0...SiteSetting.max_tag_length]
end
def self.tags_for_saving(tags_arg, guardian, opts = {})
return [] unless guardian.can_tag_topics? && tags_arg.present?
tag_names = Tag.where_name(tags_arg).pluck(:name)
if guardian.can_create_tag?
tag_names += (tags_arg - tag_names).map { |t| clean_tag(t) }
tag_names.delete_if { |t| t.blank? }
tag_names.uniq!
end
opts[:unlimited] ? tag_names : tag_names[0...SiteSetting.max_tags_per_topic]
end
def self.add_or_create_tags_by_name(taggable, tag_names_arg, opts = {})
tag_names =
DiscourseTagging.tags_for_saving(tag_names_arg, Guardian.new(Discourse.system_user), opts) ||
[]
if taggable.tags.pluck(:name).sort != tag_names.sort
taggable.tags = Tag.where_name(tag_names).all
new_tag_names =
taggable.tags.size < tag_names.size ? tag_names - taggable.tags.map(&:name) : []
taggable.tags << Tag
.where(target_tag_id: taggable.tags.map(&:id))
.where.not(id: taggable.tags.map(&:id))
.all
new_tag_names.each { |name| taggable.tags << Tag.create(name: name) }
end
end
# Returns true if all were added successfully, or an Array of the
# tags that failed to be added, with errors on each Tag.
def self.add_or_create_synonyms_by_name(target_tag, synonym_names)
tag_names =
DiscourseTagging.tags_for_saving(synonym_names, Guardian.new(Discourse.system_user)) || []
tag_names -= [target_tag.name]
existing = Tag.where_name(tag_names).all
target_tag.synonyms << existing
(tag_names - target_tag.synonyms.map(&:name)).each do |name|
target_tag.synonyms << Tag.create(name: name)
end
successful = existing.select { |t| !t.errors.present? }
synonyms_ids = successful.map(&:id)
TopicTag.where(topic_id: target_tag.topics.with_deleted, tag_id: synonyms_ids).delete_all
TopicTag.joins(DB.sql_fragment(<<~SQL, synonyms_ids: synonyms_ids)).delete_all
INNER JOIN (
SELECT MIN(id) AS id, topic_id
FROM topic_tags
WHERE tag_id IN (:synonyms_ids)
GROUP BY topic_id
) AS tt ON tt.id < topic_tags.id
AND tt.topic_id = topic_tags.topic_id
AND topic_tags.tag_id IN (:synonyms_ids)
SQL
TopicTag.where(tag_id: synonyms_ids).update_all(tag_id: target_tag.id)
Scheduler::Defer.later "Update tag topic counts" do
Tag.ensure_consistency!
end
(existing - successful).presence || true
end
def self.muted_tags(user)
return [] unless user
TagUser.lookup(user, :muted).joins(:tag).pluck("tags.name")
end
end
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