ruby on rails - Pass a variable from view to controller from form submit -

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i trying access variable sent through submit form. not appear present once form submitted.

see hidden field on line: 2

<%= form_for @import, html: { multipart: true } |f| %>   <%= f.hidden_field :tree_id, :value => @tree.id %>   <%= f.label :new_branch_data %>   <div class="help-text">locate file import. (.xls, .xlsx file type)</div>   <%= f.file_field :attachment %>   <%= f.submit "import", class: "btn btn-primary" %> <% end %>

after hitting submit action called in controller:

def index  @tree = tree.find(params[:tree_id])   ...  ... end

hangs on @tree = tree.find(params[:tree_id]) , returns

"activerecord::recordnotfound" @ /imports couldn't find tree without id

how can correct @tree variable referenced in form can passed controller?

you can inspect params you're getting guess have tree_id on params[:import] ...

def index   @tree = tree.find(params[:import][:tree_id])    ...   ... end

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