Sinatra/Carrierwave: how to update a record while using an existing image?
My super-simple Sinatra app is a list of notes, and each note has an attached image.
I've got a 'put' route set up that lets me update notes, but unless I re-upload the image, I lose it (note.image is set to 'nil' when I submit the form).
Thanks in advance for your help!
Here's my uploader:
class MyUploader < CarrierWave::Uploader::Base
include CarrierWave::MimeTypes
process :set_content_type
storage :fog
end
Here's my Note class:
class Note
include DataMapper::Resource
property :id, Serial
property :image, String, :auto_validation =&开发者_开发知识库gt; false
property :content, Text, :required => true
property :created_at, Date
property :updated_at, Date
mount_uploader :image, MyUploader
end
Here's my 'put' route:
put '/:id' do
n = Note.get params[:id]
unless n
redirect '/', :error => "Can't find that note."
end
n.image = params[:image]
n.credit = params[:content]
n.date = params[:date]
n.updated_at = Time.now
if n.save
redirect '/', :notice => 'Note updated successfully.'
else
redirect '/', :error => 'Error updating note.'
end
end
And here's the form I'm using to update notes:
<% if @note %>
<form action="/<%= @note.id %>" method="post" id="edit" enctype="multipart/form-data">
<input type="hidden" name="_method" value="put">
<p><input type="text" name="credit" value="<%=h @note.content %>"></p>
<p><input type="file" name="image" /></p>
<br><br>
<input type="submit">
</form>
<% else %>
<p>Note not found.</p>
<% end %>
A simple if check is what you need: if params[image]
is nil you skip the n.image = params[:image]
n.image = params[:image] if params[:image]
I use similar approach to create a custom Rails validation check when I work with ActiveRecord models that contain CarrierWave images. Probably it won't be a bad idea to check whether or not n.image
isn't nil as well - if it's nil I guess it should be mandatory to upload an image.
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