将参数传递给控制器​​不起作用

Question

Im fairly new to RoR so I'm trying to learn by doing some projects. The current one I'm working on is app for gym trainers with clients. When I try to create a new assessment for a client it seems as if the client_id param isn't being passed to the assessments_controller. This is the line:

<%= link_to 'New assessment', new_assessment_path(client_id: @client.id), class: "btn btn-xs btn-success" %> 

Error: Couldn't find Client with 'id'=

When on the new assessment view, however, in the debug area I see this:

--- !ruby/hash-with-ivars:ActionController::Parameters
elements:
  client_id: '1'
  controller: assessments
  action: new
ivars:
  :@permitted: false

When I then click 'create' the error occurs

assessment_controller:

 def create
   @assessment = Assessment.new(assessment_params)
   @assessment.client = Client.find(params[:client_id])
  respond_to do |format|
  if @assessment.save
    format.html { redirect_to @assessment, notice: 'Assessment was successfully created.' }
    format.json { render :show, status: :created, location: @assessment }
  else
    format.html { render :new }
    format.json { render json: @assessment.errors, status: :unprocessable_entity }
  end
end

end

Answer 1

I am pretty sure you are assigning the new_assessment_path(client_id: @client.id) to new page and when submitting form the client id not passing to create action. There are many different solutions.

1. Solution

<%= link_to 'New assessment', new_assessment_path(client_id: @client.id), class: "btn btn-xs btn-success" %>

#assestment _form.html.erb file
<%= f.hidden_field_tag 'client_id', @client_id %>

#assessments_controller:
def new
   @assessment = Assessment.new
   @client_id = params[:client_id]
end

def create
   @assessment = Assessment.new(assessment_params)
  respond_to do |format|
  if @assessment.save
    format.html { redirect_to @assessment, notice: 'Assessment was successfully created.' }
    format.json { render :show, status: :created, location: @assessment }
  else
    format.html { render :new }
    format.json { render json: @assessment.errors, status: :unprocessable_entity }
  end
end

#add :client_id
def assessment_params
   params.require(:registration).permit(..., :client_id)
end