Internal improvements 5

active_storage_db.gemspec

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-$:.push File.expand_path("lib", __dir__)
+$LOAD_PATH.unshift File.expand_path("lib", __dir__)
 
 # Maintain your gem's version:
 require "active_storage_db/version"

app/controllers/active_storage_db/files_controller.rb

@@ -17,12 +17,12 @@ def show
     def update
       if (token = decode_verified_token)
         file_uploaded = upload_file(token)
-        head(file_uploaded ? :no_content : unprocessable)
+        head(file_uploaded ? :no_content : ActiveStorageDB::UNPROCESSABLE_STATUS)
       else
         head(:not_found)
       end
     rescue ActiveStorage::IntegrityError
-      head(unprocessable)
+      head(ActiveStorageDB::UNPROCESSABLE_STATUS)
     end
 
     private
@@ -60,13 +60,5 @@ def upload_file(token) # rubocop:disable Naming/PredicateMethod
       db_service.upload(token[:key], request.body, checksum: token[:checksum])
       true
     end
-
-    def unprocessable
-      if Rails::VERSION::MAJOR > 7 || (Rails::VERSION::MAJOR == 7 && Rails::VERSION::MINOR >= 1)
-        :unprocessable_content
-      else
-        :unprocessable_entity
-      end
-    end
   end
 end

lib/active_storage/service/db_service.rb

@@ -22,12 +22,17 @@ class Service::DBService < Service
 
     def initialize(public: false, **)
       @chunk_size = [ENV.fetch("ASDB_CHUNK_SIZE") { 1.megabytes }.to_i, MINIMUM_CHUNK_SIZE].max
+      @max_size = ENV.fetch("ASDB_MAX_FILE_SIZE", nil)&.to_i
       @public = public
     end
 
     def upload(key, io, checksum: nil, **)
       instrument :upload, key: key, checksum: checksum do
         data = io.read
+        if @max_size && data.bytesize > @max_size
+          raise ArgumentError, "File size exceeds the maximum allowed size of #{@max_size} bytes"
+        end
+
         if checksum
           digest = Digest::MD5.base64digest(data)
           raise ActiveStorage::IntegrityError unless digest == checksum
@@ -50,6 +55,8 @@ def download(key, &block)
 
     def download_chunk(key, range)
       instrument :download_chunk, key: key, range: range do
+        # NOTE: from/size are derived from Range#begin and Range#size (always integers),
+        # so string interpolation into SQL is safe here.
         from = range.begin + 1
         size = range.size
         args = adapter_sqlserver? || adapter_sqlite? ? "data, #{from}, #{size}" : "data FROM #{from} FOR #{size}"
@@ -81,7 +88,7 @@ def delete_prefixed(prefix)
     def exist?(key)
       instrument :exist, key: key do |payload|
         comment = "DBService#exist?"
-        result = ::ActiveStorageDB::File.annotate(comment).where(ref: key).exists?
+        result = ::ActiveStorageDB::File.annotate(comment).exists?(ref: key)
         payload[:exist] = result
         result
       end
@@ -172,7 +179,7 @@ def retrieve_file(key)
     def object_for(key, fields: nil)
       comment = "DBService#object_for"
       scope = ::ActiveStorageDB::File.annotate(comment)
-      scope = scope.select(*fields) if fields
+      scope = scope.select(fields) if fields
       scope.find_by(ref: key)
     end
 

lib/active_storage/service/db_service_rails70.rb

@@ -6,7 +6,7 @@ def compose(source_keys, destination_key, **)
       buffer = nil
       comment = "DBService#compose"
       source_keys.each do |source_key|
-        record = ::ActiveStorageDB::File.annotate(comment).find_by(ref: source_key)
+        record = ::ActiveStorageDB::File.annotate(comment).select(:data).find_by(ref: source_key)
         raise ActiveStorage::FileNotFoundError unless record
 
         if buffer

lib/active_storage_db/engine.rb

@@ -1,6 +1,14 @@
 # frozen_string_literal: true
 
 module ActiveStorageDB
+  # :nocov:
+  UNPROCESSABLE_STATUS = if Rails::VERSION::MAJOR > 7 || (Rails::VERSION::MAJOR == 7 && Rails::VERSION::MINOR >= 1)
+                           :unprocessable_content
+                         else
+                           :unprocessable_entity
+                         end
+  # :nocov:
+
   class Engine < ::Rails::Engine
     isolate_namespace ActiveStorageDB
   end

lib/tasks/active_storage_db_tasks.rake

@@ -9,21 +9,30 @@ module ActiveStorage
     end
 
     def print_blob(blob, digits: 0)
-      size = if blob.byte_size < 1024
-               "#{blob.byte_size}B".rjust(8)
-             else
-               "#{blob.byte_size / 1024}K".rjust(8)
-             end
+      size = format_size(blob.byte_size)
       date = blob.created_at.strftime("%Y-%m-%d %H:%M")
       puts "#{size}  #{date}  #{blob.id.to_s.rjust(digits)}  #{blob.filename}"
     end
+
+    def format_size(bytes)
+      if bytes >= 1.gigabyte
+        "#{(bytes / 1.gigabyte.to_f).round(1)}G".rjust(8)
+      elsif bytes >= 1.megabyte
+        "#{(bytes / 1.megabyte.to_f).round(1)}M".rjust(8)
+      elsif bytes >= 1.kilobyte
+        "#{bytes / 1024}K".rjust(8)
+      else
+        "#{bytes}B".rjust(8)
+      end
+    end
   end
 end
 
 namespace :asdb do
   desc "ActiveStorageDB: list attachments ordered by blob id desc"
-  task list: [:environment] do |_t, _args|
-    query = ActiveStorage::Blob.order(id: :desc).limit(100)
+  task :list, [:count] => [:environment] do |_t, args|
+    count = (args[:count] || 100).to_i
+    query = ActiveStorage::Blob.order(id: :desc).limit(count)
     digits = query.ids.inject(0) { |ret, id|
       size = id.to_s.size
       [size, ret].max

spec/dummy/app/controllers/posts_controller.rb

@@ -32,7 +32,7 @@ def create
         format.json { render :show, status: :created, location: @post }
       else
         format.html { render :new }
-        format.json { render json: { errors: @post.errors }, status: unprocessable }
+        format.json { render json: { errors: @post.errors }, status: ActiveStorageDB::UNPROCESSABLE_STATUS }
       end
     end
   end
@@ -46,7 +46,7 @@ def update
         format.json { render :show, status: :ok, location: @post }
       else
         format.html { render :edit }
-        format.json { render json: { errors: @post.errors }, status: unprocessable }
+        format.json { render json: { errors: @post.errors }, status: ActiveStorageDB::UNPROCESSABLE_STATUS }
       end
     end
   end
@@ -70,8 +70,4 @@ def load_post
   def post_params
     params.fetch(:post) { {} }.permit!
   end
-
-  def unprocessable
-    Rails::VERSION::MAJOR > 7 || (Rails::VERSION::MAJOR == 7 && Rails::VERSION::MINOR >= 1) ? :unprocessable_content : :unprocessable_entity
-  end
 end

spec/dummy/db/schema.rb

@@ -10,33 +10,34 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 20_220_202_010_101) do
+ActiveRecord::Schema[7.1].define(version: 2026_03_21_000000) do
   create_table "active_storage_attachments", force: :cascade do |t|
-    t.string "name", null: false
-    t.string "record_type", null: false
-    t.bigint "record_id", null: false
     t.bigint "blob_id", null: false
     t.datetime "created_at", null: false
+    t.string "name", null: false
+    t.bigint "record_id", null: false
+    t.string "record_type", null: false
     t.index ["blob_id"], name: "index_active_storage_attachments_on_blob_id"
     t.index ["record_type", "record_id", "name", "blob_id"], name: "index_active_storage_attachments_uniqueness", unique: true
   end
 
   create_table "active_storage_blobs", force: :cascade do |t|
-    t.string "key", null: false
-    t.string "filename", null: false
-    t.string "content_type"
-    t.text "metadata"
-    t.string "service_name", null: false
     t.bigint "byte_size", null: false
     t.string "checksum", null: false
+    t.string "content_type"
     t.datetime "created_at", null: false
+    t.string "filename", null: false
+    t.string "key", null: false
+    t.text "metadata"
+    t.string "service_name", null: false
     t.index ["key"], name: "index_active_storage_blobs_on_key", unique: true
   end
 
   create_table "active_storage_db_files", force: :cascade do |t|
-    t.string "ref", null: false
-    t.binary "data", null: false
     t.datetime "created_at", precision: nil, null: false
+    t.binary "data", null: false
+    t.string "ref", null: false
+    t.datetime "updated_at"
     t.index ["ref"], name: "index_active_storage_db_files_on_ref", unique: true
   end
 
@@ -47,10 +48,10 @@
   end
 
   create_table "posts", force: :cascade do |t|
-    t.string "title"
     t.text "content"
-    t.boolean "published"
     t.datetime "created_at", null: false
+    t.boolean "published"
+    t.string "title"
     t.datetime "updated_at", null: false
   end