Rails:Limiting how many files a user can upload

Question

Users can upload multiple pictures for their posts in my rails app using active storage, is it possible to limit exactly how many photos they can upload in the form?I want to limit it to 4 pictures per user.

<%= f.file_field :images, multiple: true, required: false  %>

demir · Accepted Answer · 2019-10-29T15:44:46.393

3

You can write custom validation. Add the following code to the related model.

validate :validate_images

private
def validate_images
  return if images.count <= 4

  errors.add(:images, 'You can upload max 4 images')
end

Also you can check the limit on the client side. The following code is from this answer

$(function(){
  $("input[type='submit']").click(function(){
    var fileUpload = $("input[type='file']");
    if(parseInt(fileUpload.get(0).files.length) > 4) {
      alert('You can upload max 4 images');
    }
  });    
});

edited Oct 29 '19 at 15:44

answered Oct 29 '19 at 15:17

demir

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i'm getting this error "undefined method `images?' for # Did you mean? images images=" – Eric Oct 29 '19 at 15:27
@sokoine can you share model class? – demir Oct 29 '19 at 15:29
the class is Post , "NoMethodError in PostsController#update" – Eric Oct 29 '19 at 15:33

Rails:Limiting how many files a user can upload

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