Are there any rationalies to make queries obtained by joining scope to be
readonly? I read some old posts (pre-rails3) that joins adds additional
columns to record so that ActiveRecord doesn't know how to update that
fields, but actually I don't see that fields. For example I write model
class Order < ActiveRecord::Base
has_and_belongs_to_many :executors, class_name: 'Specialist', join_table:
'order_executors'
scope :by_executor, ->(executor_id) {
joins(:executors).where(specialists: {id: executor_id} ) }
end
and make query Order.by_executor(1) so that I get:
Order Load (2.0ms) SELECT "orders".* FROM "orders" INNER JOIN
"order_executors" ON "order_executors"."order_id" = "orders"."id" INNER
JOIN "specialists" ON "specialists"."id" =
"order_executors"."specialist_id" WHERE "specialists"."id" = 1
=> [#<Order id: 20, orderable_id: 11, orderable_type: "PlanDevelopment",
client_id: 1, completion_status: "finished", created_at: "2013-05-13
20:48:19", updated_at: "2013-05-14 00:36:38", price:
#<BigDecimal:67e5898,'0.14E2',9(36)>>]
I see no additional columns but Order.by_executor(1).first.readonly? is
true. Is that necessary?
p.s. Yes I know that I can set readonly(false) or explicitly specify select
clause - so that records won't become readonly. But I want to understand
why this blocking behavior is necessary (if it is still true) and what
damage will be possible without readonly mark? Also I don't understand, how
can I shot myself if I explicitly set readonly(false).
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