可以放弃吗?在activerecord模型上有另一个调用时全部放弃?

如果我正确理解代码,那么大多数查询方法实际上都被委托给 :all . 你可以避免 .all 因为activerecord实际上是在为大多数用户添加它。

https://github.com/rails/rails/blob/b1879124a82b34168412ac699cf6f654e005c4d6/activerecord/lib/active_record/querying.rb

module ActiveRecord
  module Querying
    delegate :find, :take, :take!, :first, :first!, :last, :last!, :exists?, :any?, :many?, to: :all
    delegate :second, :second!, :third, :third!, :fourth, :fourth!, :fifth, :fifth!, :forty_two, :forty_two!, to: :all
    delegate :first_or_create, :first_or_create!, :first_or_initialize, to: :all
    delegate :find_or_create_by, :find_or_create_by!, :find_or_initialize_by, to: :all
    delegate :find_by, :find_by!, to: :all
    delegate :destroy, :destroy_all, :delete, :delete_all, :update, :update_all, to: :all
    delegate :find_each, :find_in_batches, to: :all
    delegate :select, :group, :order, :except, :reorder, :limit, :offset, :joins,
             :where, :rewhere, :preload, :eager_load, :includes, :from, :lock, :readonly,
             :having, :create_with, :uniq, :distinct, :references, :none, :unscope, to: :all
    delegate :count, :average, :minimum, :maximum, :sum, :calculate, to: :all
    delegate :pluck, :ids, to: :all

是的,移除它是安全的。

为了确保在控制台中运行这两个查询:

Profile.active.all.to_sql
Profile.active.to_sql