我在CarrierWave上苦苦挣扎，所以我做了一个小程序，看我能否做得到：
require 'sinatra'
require 'dm-core'
require 'dm-migrations'
require 'carrierwave/datamapper'
class ImageUploader < CarrierWave::Uploader::Base
include CarrierWave::MiniMagick
end
DataMapper.setup(:default, "sqlite3://#{Dir.pwd}/photogallery.sqlite3")
class Image
include DataMapper::Resource
property :id, Serial
property :title, Text
mount_uploader :image, ImageUploader
end
DataMapper.finalize
DataMapper.auto_migrate!
get "/" do
@images = Image.all
erb :index
end
post "/" do
image = Image.new(:title => params[:title])
image.image = params[:image]
image.save
redirect "/"
end
__END__
@@ index
<% @images.each do |image| %>
<p>
<%= image.title %>
</p>
<a href="<%= image.image.url %>">
<img src="<%= image.image.url %>">
</a>
<% end %>
<form action="/" method="post">
<label for="title">Title</label>
<input type="text" name="title"><br>
<label for="image">Image</label>
<input type="file" name="image"><br>
<input type="submit" value="Save">
</form>
当从计算机上载图像时，似乎无法显示图像。好像图像没有保存在任何地方，因此无法检索它们。
定位标记正确引用了图像应在的位置，但没有图像。
我在做什么错？
为@MrMos转换为answer ...
没关系，我发现了。我改为这样做：
require 'sinatra'
require 'dm-core'
require 'dm-migrations'
require 'carrierwave/datamapper'
DataMapper.setup(:default, "sqlite3://#{Dir.pwd}/development.db")
class ImageUploader < CarrierWave::Uploader::Base
storage :file
def store_dir
'images'
end
end
class Image
include DataMapper::Resource
property :id, Serial
property :title, Text
mount_uploader :file, ImageUploader
end
DataMapper.finalize
DataMapper.auto_migrate!
get '/' do
@images = Image.all
erb :index
end
post '/' do
Image.create(params[:image])
redirect to('/')
end
__END__
@@ index
<!DOCTYPE html>
<html>
<body>
<form action="/" method="post" enctype="multipart/form-data"></div>
<input type="text" name="image[title]" />
<input type="file" name="image[file]" />
<input type="submit" name="submit" value="Upload" />
</form>
<% @images.each do |image| %>
<p><%= image.title %></p>
<img src="/images/<%= images.file_identifier %>" />
<% end %>
</body>
</html>