Refactor how public and tag timelines are queried (#14728)

app/models/public_feed.rb

@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+class PublicFeed < Feed
+  # @param [Account] account
+  # @param [Hash] options
+  # @option [Boolean] :with_replies
+  # @option [Boolean] :with_reblogs
+  # @option [Boolean] :local
+  # @option [Boolean] :remote
+  # @option [Boolean] :only_media
+  def initialize(account, options = {})
+    @account = account
+    @options = options
+  end
+
+  # @param [Integer] limit
+  # @param [Integer] max_id
+  # @param [Integer] since_id
+  # @param [Integer] min_id
+  # @return [Array<Status>]
+  def get(limit, max_id = nil, since_id = nil, min_id = nil)
+    scope = public_scope
+
+    scope.merge!(without_replies_scope) unless with_replies?
+    scope.merge!(without_reblogs_scope) unless with_reblogs?
+    scope.merge!(local_only_scope) if local_only?
+    scope.merge!(remote_only_scope) if remote_only?
+    scope.merge!(account_filters_scope) if account?
+    scope.merge!(media_only_scope) if media_only?
+
+    scope.cache_ids.to_a_paginated_by_id(limit, max_id: max_id, since_id: since_id, min_id: min_id)
+  end
+
+  private
+
+  def with_reblogs?
+    @options[:with_reblogs]
+  end
+
+  def with_replies?
+    @options[:with_replies]
+  end
+
+  def local_only?
+    @options[:local]
+  end
+
+  def remote_only?
+    @options[:remote]
+  end
+
+  def account?
+    @account.present?
+  end
+
+  def media_only?
+    @options[:only_media]
+  end
+
+  def public_scope
+    Status.with_public_visibility.joins(:account).merge(Account.without_suspended.without_silenced)
+  end
+
+  def local_only_scope
+    Status.local
+  end
+
+  def remote_only_scope
+    Status.remote
+  end
+
+  def without_replies_scope
+    Status.without_replies
+  end
+
+  def without_reblogs_scope
+    Status.without_reblogs
+  end
+
+  def media_only_scope
+    Status.joins(:media_attachments).group(:id)
+  end
+
+  def account_filters_scope
+    Status.not_excluded_by_account(@account).tap do |scope|
+      scope.merge!(Status.not_domain_blocked_by_account(@account)) unless local_only?
+      scope.merge!(Status.in_chosen_languages(@account)) if @account.chosen_languages.present?
+    end
+  end
+end