Param Is Missing or the Value Is Empty: User Rails 4

Rails: param is missing or the value is empty: admin

I finally figured it out after careful examination of my logs.

Here's how I solved it:

I examined the request parameters of the create action and I realized that it was of this format:

{"authenticity_token"=>"qJWlHz7Z5myTH3dwNIjjSOzRDY7JN+LoovaG+8dMBnGFRWImJKlWp8cgF7kwTqJXIxqU2fGVkqW9nhOAJ8vFIg==",
 "user_admin"=>{"email"=>"promise@gmail.com", "password"=>"[FILTERED]", "role"=>""},
 "commit"=>"Create Admin"}

So the request parameters have a hash key of user_admin with values email, password and role, whereas I was passing the admin hash key in my admins_controller.

All I had to do was to modify the admins_params private method in my admins_controller:

From this:

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

To this:

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

and that solved the issue.

If you have such an issue, always endeavour to inspect your request parameters in your logs or your application trace. That will give you a lot of information that will help you to resolve the issue.

That's all.

I hope this helps

param is missing or the value is empty: name -what exact value to put in require

Just make following changes in your controller,

def user_params
  params.require(:user_crud).permit(:name, :email)
end

As your params contains form inputs under user_crud key.

param is missing or the value is empty: activity Rails 4

Controller

def create
        @todo = Todo.create(todo_params)

        respond_to do |format|
          if  @todo.save
            format.html { redirect_to location_path, notice: 'Todo was successfully created.' }

          else
            format.html { render :new }
           }
          end
        end
      end

Params

def todo_params
  params.require(:todo).permit(:name, :activity)
end

param is missing or the value is empty: message

Error comes from params.require(:message) because your incoming params does not contain :message key (it has "/messages").

This originates in your view - you pass messages_path (which is "/messages") in place of field name/model to form_for. Try:

form_for :message, url: messages_path do |f|
   ...

ParameterMissing - param is missing or the value is empty: user

require ensures that a parameter is present. If it's present, returns the parameter at the given key, otherwise raises an ActionController::ParameterMissing error.

You are requiring user parameter but it's missing from the params.

To get this you have many ways.

Method 1:

Removing require should do the trick.

params.permit(:type)

Method2:

Add a user[] as a name to the input in the edit form.

Will elaborate the method 1 if you add the edit form.

Method3:

The other solution is to add the user key to the parameters.

def update
    if current_admin
        params.user = {
            "type": params.type,
            "id": params.id
        }
      if @user.update(user_params)
        redirect_to users_path
      else
        render 'edit'
      end
    end
  end

  private
  def user_params
    params.require(:user).permit(:type)
  end

reference to api documentaiton

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