I'm just getting my head wrapped around MVC in .net using VS 2013.
I need a little direction in regards to uploading a file (which is easy) but also inserting data about that image into a database. Specifically I want to allow the end user to enter a description, title etc. about the file being uploaded. On the back-end I want to also add to the meta data a 'Date Created', 'Path to the file', 'Category', and the File Name and a couple other pieces of data that will help with presenting files in the views. I don't want to insert the files in the DB but just use the path in the generated HTML to point to the physical file so the end user can view or download it.
Multiple file types are being used, Audio, Video, Documents, Images.
I can get the file upload to work but writing the controller to accept a file, and end user input, then also add the other fields I need into the database that the user never sees is where I'm stuck. Blending the file upload with the user fields and beack end data is confusing me on how to get all the pieces to work together.
So in short getting File Upload + User Input + non-User Input values all in the same View, Controller, and Model is what I need direction on.
You have to upload your image plus data in a multi-part form.
In your view you will create a POST form that uses "multipart/form-data" encoding, you can then include inputs for model data and your file upload control within the body of the form. When it submits will will create a multi-part form, one part will contain the binary file and another part will contain your data.
On the controller action side you will receive the data with an action akin to
public ActionResult PostFile(MyModel model, HttpPostedFileBase file) {...}
There are numerous posts on SO with more details so I won't go into that.
Related
In a rails 4 application, how can I convert an excel spreadsheet file into pdf.
When I am trying to implement Excel to pdf the contents are listed in different pages if excel column size is large.
How to generate the pdf without moving data to next pages in pdf.
Please help,
Thanks
So you basically have two options you can either implement this yourself and use a CSV gem/library (default CSV, faster CSV, or smarter CSV) assuming that by "excel" a CSV is acceptable. If a CSV is not acceptible you can use the axlsx gem instead. Then for pdf conversion you can use something like prawn. If you decide to build this yourself follow these steps.
Create a controller that will handle Reports, I suggest using the rails g controller report upload generate_table show generate_pdf generator to create a controller and a view for the upload process
Create a file upload form in the upload view.
On submit you will send the file to the generate action processing with one of the CSV or excel gems
Once processed your end product should be an array or hash (as an instance variable) and you can send that to the show action
In the show view you will iterate of that hash/array and incapsulate the contents in a html table.
On the show view you should have a button that will send that same hash/array to the generate_pdf controller action where you will use prawn to create a pdf, you can use something like send_data to the send the completed pdf file back to the user.
This is roughly how you could go about it less the low level details. Now if you wanted to use an out of the box solution you could use something like Ruport. Ruport will handle most of the heavy lifting for you the only thing is you need to have your models and associations set up to use it the way it is designed, and that may not be an option for you.
I recently am given a task by upper management to implement a mass upload coupon task. The goal is to allow users to upload an list of coupon codes (excel or csv), and subsequently giving these coupons codes attributes such as start date, expiry, quantity and so on.
I have already implemented a form to input these attributes. The current implementation method I am doing is as follows:
1.I upload a list of coupon codes (eg: 333245454dfee) and I do not write them directly to the database, instead I converted them to string and display on a page for the user to view. (done)
2.from that view page, there is a form with all the attributes. The user can then input these attributes. (done)
3.The user can create all of these coupons codes with the attributes set.
However, I am stuck now because I am unsure of how to mass create multiple codes and attach all the attributes to them. Right now, I can only create one coupon at a time.
So, to summarize, I would like to ask is it possible to
have a field that contains all the codes I have uploaded
I have others fields for different attributes
how to create all the codes I have uploaded as separate models.
I do not need the codes, I would like to hear what approach there are. I am thinking of creating a variable to store these coupons codes first, then loop them. But I have no idea how to do all of that by pressing one single button.
Thanks in advance.
Hmm, how I would approach this problem would be to have the user upload an csv file with 1 column and multiple rows of coupon. Using carrierwave to upload the file and parse the csv file. After parsing it, you should have an array of coupon and you can just input them into the database.
A good reference for your problem would be http://railscasts.com/episodes/396-importing-csv-and-excel
I'm new in RoR.
I want to make that logic:
User upload xml or csv file from /home (static_pages#home) and send it to elms#el_select
If file is xml and file contain more than one element I want to show page to user so him choose which element he want to show
If file is csv or xml with one element I want to show result page
So here is two use-cases:
- choose file - view results
- choose file - choose element - view results
In second case I upload file in static_pages#home, send it to elms#el_select and I don't know how to send it from elms#el_select to result page.
In first case I don't know how to skip page rendering and send file to another controller
Controllers do not store files for up/download or any other data. They just manipulating with instances of their models (with their behaviour). So, if I have understand your question in the right way, the order may be next:
StatiPagesController take the file from user and store it somewhere (/tmp or smth.) if the file is valid;
ElmsController take the file from storage and render the proper view (or redirect_to proper view if such already exist).
Finally, I've found answer on my question:
#key = SecureRandom.uuid
Rails.cache.write(#key, #file)
I'm trying to write a piece of functionality that creates a record from a template in my Rails app, but with some customisations from the user.
The difficulty comes when trying to let the user override a field in an embedded document: the document is duplicated rather than updated.
I start with an object of type, let's say, ExternalLinkGroupTemplate, and it contains a number of ExternalLinks. It's used to create an ExternalLinkGroup which also contains ExternalLinks. The user should be able to edit the link text when it's cloned but not the URL, so the user is presented with a form When it's copied the user should be able to I can create a copy of it with (simplified because some of the code is in different files, remove tests for success etc):
#link_group = ExternalLinkGroup.new
#template.links.each do {|link| #new_link_group.links.push link.dup }
#link_group.update_attributes(params[:link_group])
When the link group is created, it contains twice as many links as the template, and only the second set has the changes. Clearly, Mongoid/ActiveWhatever is creating new items rather than updating existing ones.
I don't want to just pass through all the fields in the parameters without duplicating anything because there's actually some inheritance going on and some of the links will be of different types and have extra fields, and I don't want to code a partial for each of them that just has a bunch of hidden fields. Also, I don't want the user to be able to modify the hidden fields and submit whatever.
I can't reference them by _id because they're not saved yet. I was expecting the array index of template[links_attributes] to be sufficient but it's not.
What do?
Using Rails 3.2.13, MongoDB 2.2.x, Mongoid 3.0.5.
hai all,
i have one problem regarding to return the form file value is validation fail. i have one form that have a few field to be fullfil by the user and one attachment field.if one of the field is blank the system will give the error when submit the form..my problem is, all the field will have the value that we entered before this but for form file it disappear.
Let's see if I understand your issue: You have a form with several input fields, and among them a <input type=file> for uploading some file content. In case of validation error, you return to that page (with struts2 result = INPUT, I guess) and the content of the previously filled fields appears, except for the FILE field.
This makes sense, if you understand how the other fields are "refilled" in Struts2 in this scenario (just from the action, which has typically mapped the parameters to properties). The server doesnt know the (clientside) fullpath of the file, it is not sent along the http request (it would be a privacy issue), it's the content of the file what is uploaded (and perhaps the filename without path). You can't escape that.
Anyway, I think this a case in which validation should signal an error early (in javascript, in the client side). Think about it: the user is uploading a file (potentially large) together with other info, and AFTER uploading it the server checks the fields and instructs the user to refill the fields and retry (including the upload). This can be unacceptable. My advise is, then, to include client-side validation (and if it pass, and the server validation fails, then the user must resign to refill the FILE field). If the file is large, one could split the input form in two pages, a first one to fill the several fields, and afterwards another to upload the file.