Using simple_form, how do I render a 'new' form on the view of another controller in a DRY way?

Question

I have a _form.html.erb partial, for my DailyEntry model that looks like this:

<%= simple_form_for(@daily_entry) do |f| %>
  <%= f.error_notification %>

  <div class="form-inputs">
    <%= f.input :breakfast %>
    <%= f.input :snack_1 %>
    <%= f.input :lunch %>
    <%= f.input :snack_2 %>
    <%= f.input :dinner %>
    <%= f.input :water_intake %>
    <%= f.input :workout %>
    <%= f.input :notes %>
  </div>

  <div class="form-actions">
    <%= f.button :submit %>
  </div>
<% end %>

Each DailyEntry belongs to a User ...ie each daily_entry record has a user_id column.

I would like for the current_user to be able to add a daily_entry from the Home#Index page - WITHOUT duplicating the create action of my DailyEntry controller.

So how do I kill 2 birds with one stone? ie assign the newly created daily_entry record to the current user, and then also have this all done from my views/home/index.html.erb ?

Edit 1

I know how to assign each record to a user....in the DailyEntry controller create action, I have this:

def create
  @daily_entry = current_user.daily_entries.create(params[:daily_entry])

respond_to do |format|
  if @daily_entry.save
    format.html { redirect_to @daily_entry, notice: 'Daily entry was successfully created.' }
    format.json { render json: @daily_entry, status: :created, location: @daily_entry }
  else
    format.html { render action: "new" }
    format.json { render json: @daily_entry.errors, status: :unprocessable_entity }
  end
 end
end

I am just not sure how to get this done from my Home#Index.html.erb . How do I render this form without duplicating that controller logic in my HomeController ?

Edit 2

I also tried this:

<%= render partial: "daily_entries/form", @daily_entry => current_user.daily_entries.build  %>

But I still get this error:

NoMethodError at /
undefined method `model_name' for NilClass:Class

At line:

<%= simple_form_for(@daily_entry) do |f| %>

Answer 1

The create action on your daily_entries controller is where your form action points to, and this is not going to change.

To render the form on the index page, all you have to do is build the @daily_entry object in your home_controller:

# home_controller.rb
def index
    @daily_entry = DailyEntry.new
end

# home/index.html.erb
<%= render "daily_entries/form" %>