This is useful because if files which are normally composed of binary are represented as strings, they can be transmitted using JSON. What are MIME types, you might ask?
MIME stands for Multipurpose Internet Mail Extensions , and it is essentially a description of what kind of file a given file is supposed to be. This meant that they were unable to be opened, and effectively broken. I eventually managed to solve the issue, using a Paperclip method Paperclip. Hopefully you get the gist, which is that form data is interfaced via a FormData object instantiated with the new keyword, which is filled with data and used as the body for a POST request.
Unable to find any helpful articles pertaining to my predicament, I exasperatedly turned to base64 and the more familiar JSON format, which brought with it its own cavalcade of issues as detailed above. Once you set up the route for your endpoint, configure a controller action to handle that endpoint, and direct your fetch request to that endpoint, you should receive data that looks something like this:.
Obviously a lot of the details will look different for your particular setup — this screenshot is taken from the app I was working on, which involved uploading images that would be associated with music sample libraries. But the general structure should be similar. Sign in. Dakota Lillie Follow. This validation will only verify the content type provided by the user, so is only really designed to prevent accidental uploads of incorrect file types rather than for any security purposes.
Open up your Post model and add the following to your attachment. When you now try to upload an image with the incorrect content type, an error will be added to your post model on save. There are two ways you can allow an attachment to be deleted from a model. The most simple is to simply call destroy on the attachment object. Alternatively, you can use a checkbox on your form to submit a request to delete an attachment when the model is saved.
To implement this, we need to add a checkbox to our form as appropriate:. Now, give this a go. Open up your form, check the checkbox, and submit the form. You should find that the cover photo is removed when your post is successfully saved. Now, we've uploaded a file, and in some circumstances that'll be all that's required, however, there are other things that you should be looking at next.
If you're working with images, like we are in our blog, you may want to automatically create some thumbnails of the images you upload.
I'll cover this my next post, where we will discuss adding image resizing, and improving validation for ensuring an uploaded file is an actually image.
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Active Oldest Votes. Community Bot 1 1 1 silver badge. Chris C. Thanks for the response Chris. So, I looked into that too. I added :attachment to create action only and then created a new "bug". On submit, I get "unknown attribute: attachment". So do I need to generate my controller again and include :attachment?
I hadn't done this because I was thinking the file name at least not yet wasn't getting inserted into the database. Then again, I don't really know what I'm talking about. I will try it and update my comment. Quick update, as I'm still researching, so I generated a new model, and ran rake db:migrate and am I now getting a new error progress!
Edited the answer with a couple possible solutions. I got it work.
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