Ruby on Rails receiving Internal Server Error: expected Array (got String) for param

问题

I have a loop in a form and I'm trying to create multiple data with same name but I'm getting an error with my syntax.

I had another question to the same application HERE where I had a mass-assignment error because of the numbers in the array

<%= form_for [@hourable, @hour] do |f| %>

<% (1..7).each do |i| %>
  <%= select_tag "hour[#{i}][day]", options_for_select(days_hours) %>
  <%= select_tag "hour[#{i}][open_time]", options_for_select([ ... %>
  <%= select_tag "hour[#{i}][open_time]", options_for_select([ ... %>

<% end %>

<% end %>

Which is coming from [#{i}]. So I tried removing this, because I thought it would give me this array:

"hours" = 
[{"day"=>"Sunday","open_time"=>"6", "close_time"=>"6"}, 
{"day"=>"Monday","open_time"=>"6", "close_time"=>"6"},
{"day"=>"Tuesday","open_time"=>"6", "close_time"=>"6"}]

Originally I had this:

"hour"=>{
 "1"=>{"day"=>"Sunday","open_time"=>"6","close_time"=>"6"},
 "2"=>{"day"=>"Sunday","open_time"=>"6","close_time"=>"6"},
 "3"=>{"day"=>"Sunday","open_time"=>"6","close_time"=>"6"}
}

How do I get to the correct array?

Thanks!

Edit:

Controller:

class HoursController < ApplicationController
  before_filter :get_hourable
  def new
    @hour = @hourable.hours.new
  end
  def create
    @hour = @hourable.hours.new(params[:hour])
  end

  private
  def get_hourable
    @hourable = params[:hourable].camelize.constantize.find_by_user_id(current_user)
  end

  def hourable_id
    params[(params[:hourable].singularize + "_id").to_sym]
  end
end

day_hours in my helper

def days_hours
[
  ['Sunday', 'Sunday'],
  ['Monday', 'Monday'],
  ['Tuesday', 'Tuesday'],
  ['Wednesday', 'Wednesday'],
  ['Thursday', 'Thursday'],
  ['Friday', 'Friday'],
  ['Saturday', 'Saturday']
]
end

This is my model:

class Hour < ActiveRecord::Base

  attr_accessible :day, :open_time, :close_time, :days_attributes
  include IceCube
  belongs_to :hourable, polymorphic: true
  belongs_to :professional

  serialize :schedule, Hash
  serialize :hour, Hash

end

回答1:

Try this:

<%= form_for [@hourable, @hour] do |f| %>

  <% 7.times do %>
    <%= select_tag "hour[][day]", options_for_select(days_hours) %>
    <%= select_tag "hour[][open_time]", options_for_select([ ... %>
    <%= select_tag "hour[][close_time]", options_for_select([ ... %>
  <% end %>

<% end %>

Starting with hour[] generates an array within params[:hour]. Each element in the array will have the keys after hour[] - in this case, :day, :open_time, and :close_time.

来源：https://stackoverflow.com/questions/23272276/ruby-on-rails-receiving-internal-server-error-expected-array-got-string-for-p