Provide attachment writers

Permit creating a record and attaching files in a single step.

    # Before:
    User.create!(user_params.except(:avatar)).tap do |user|
      user.avatar.attach(user_params[:avatar])
    end

    # After:
    User.create!(user_params)

[Yoshiyuki Hirano & George Claghorn]

1 files changed, 8 insertions, 0 deletions

diff --git a/activestorage/lib/active_storage/attached/macros.rb b/activestorage/lib/active_storage/attached/macros.rb
index f0256718ac..2b38a9b887 100644
--- a/activestorage/lib/active_storage/attached/macros.rb
+++ b/activestorage/lib/active_storage/attached/macros.rb
@@ -32,6 +32,10 @@ module ActiveStorage
         def #{name}
           @active_storage_attached_#{name} ||= ActiveStorage::Attached::One.new("#{name}", self, dependent: #{dependent == :purge_later ? ":purge_later" : "false"})
         end
+
+        def #{name}=(attachable)
+          #{name}.attach(attachable)
+        end
       CODE
 
       has_one :"#{name}_attachment", -> { where(name: name) }, class_name: "ActiveStorage::Attachment", as: :record
@@ -73,6 +77,10 @@ module ActiveStorage
         def #{name}
           @active_storage_attached_#{name} ||= ActiveStorage::Attached::Many.new("#{name}", self, dependent: #{dependent == :purge_later ? ":purge_later" : "false"})
         end
+
+        def #{name}=(attachables)
+          #{name}.attach(attachables)
+        end
       CODE
 
       has_many :"#{name}_attachments", -> { where(name: name) }, as: :record, class_name: "ActiveStorage::Attachment"