forked from fedi/mastodon
122 lines
1.9 KiB
Ruby
122 lines
1.9 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
class Trends::Query
|
|
include Redisable
|
|
include Enumerable
|
|
|
|
attr_reader :prefix, :klass, :loaded
|
|
|
|
alias loaded? loaded
|
|
|
|
def initialize(prefix, klass)
|
|
@prefix = prefix
|
|
@klass = klass
|
|
@records = []
|
|
@loaded = false
|
|
@allowed = false
|
|
@limit = nil
|
|
@offset = nil
|
|
end
|
|
|
|
def allowed!
|
|
@allowed = true
|
|
self
|
|
end
|
|
|
|
def allowed
|
|
clone.allowed!
|
|
end
|
|
|
|
def in_locale!(value)
|
|
@locale = value
|
|
self
|
|
end
|
|
|
|
def in_locale(value)
|
|
clone.in_locale!(value)
|
|
end
|
|
|
|
def offset!(value)
|
|
@offset = value.to_i
|
|
self
|
|
end
|
|
|
|
def offset(value)
|
|
clone.offset!(value)
|
|
end
|
|
|
|
def limit!(value)
|
|
@limit = value.to_i
|
|
self
|
|
end
|
|
|
|
def limit(value)
|
|
clone.limit!(value)
|
|
end
|
|
|
|
def records
|
|
load
|
|
@records
|
|
end
|
|
|
|
delegate :each, :empty?, :first, :last, :size, to: :records
|
|
|
|
def to_ary
|
|
records.dup
|
|
end
|
|
|
|
alias to_a to_ary
|
|
|
|
def to_arel
|
|
if ids_for_key.empty?
|
|
klass.none
|
|
else
|
|
scope = klass.joins(sanitized_join_sql).reorder('x.ordering')
|
|
scope = scope.offset(@offset) if @offset.present?
|
|
scope = scope.limit(@limit) if @limit.present?
|
|
scope
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def key
|
|
[@prefix, @allowed ? 'allowed' : 'all', @locale].compact.join(':')
|
|
end
|
|
|
|
def load
|
|
unless loaded?
|
|
@records = perform_queries
|
|
@loaded = true
|
|
end
|
|
|
|
self
|
|
end
|
|
|
|
def ids_for_key
|
|
@ids_for_key ||= redis.zrevrange(key, 0, -1).map(&:to_i)
|
|
end
|
|
|
|
def sanitized_join_sql
|
|
ActiveRecord::Base.sanitize_sql_array(join_sql_array)
|
|
end
|
|
|
|
def join_sql_array
|
|
[join_sql_query, ids_for_key]
|
|
end
|
|
|
|
def join_sql_query
|
|
<<~SQL.squish
|
|
JOIN unnest(array[?]) WITH ordinality AS x (id, ordering) ON #{klass.table_name}.id = x.id
|
|
SQL
|
|
end
|
|
|
|
def perform_queries
|
|
apply_scopes(to_arel).to_a
|
|
end
|
|
|
|
def apply_scopes(scope)
|
|
scope
|
|
end
|
|
end
|