Rails 5：如何发送多个记录的发布请求

Question

This is what I am trying to do:

= form_tag(path) do
    - @items.each do |i|
        = fields_for "i[]", i do
            %input.content{:name => "content", :type => "hidden"}
    = submit_tag "Submit"

As you can see, I try to pass the value of all .content inputs from items to a path.

These are the parameters I get:

{"utf8"=>"✓", "content"=>"", "commit"=>"Submit"}

I'd expect something like this:

{"items": [
    {
        "id":1,
        "content":""
    },
    {
        "id":2,
        "content":""
    },
    {
        "id":3,
        "content":""
    },
] }

How do you create those POST requests in rails?

Answer 1

This is simpler than you've been trying to make it. You tend to only need fields_for if you have a set of fields for each of the nested models. here you just have a single hidden column, so I'd choose to just use a single hidden field eg:

= form_tag(path) do |f|
    - @items.each do |i|
      = f.hidden_field "items[#{i.id}]", value: i.content
    = submit_tag "Submit"

Note: not bug-testing left as an exercise to the reader.

This will generate a set of parameters that map the id of the item vs the content eg: "items"=>{"38383285"=>"", "304713261"=>"Some content here", "547539357"=>"Some other content here"}

Which you can just iterate through to change the actual values however you like.

You have not provided any example of the actual structure of your models - so I am guessing how you would use that... you will need to (possibly heavily) modify the example below to meet your actual needs. For one thing - given it's a hidden field - I have no idea what other model (and column) it is that you are trying to update. So lets pretend you have a second model called OtherItem that also has a content-field and maps to an Item via an item_id column. In that case, you'd do something like this:

def my_action
  item_ids = params[:items].keys
  items = OtherItem.where(:item_id => item_ids)
  items.each do |item|
    item.update(content: params[:items][item.item_id])
  end
  # other stuff here

end