Ruby on rails 4 如何向事件添加多个条目

我正在尝试为一个活动添加乐队，我的所有其他弦乐等都很好，但当我尝试添加乐队时，什么都没有出现

这是我的create gigs.rb：

class CreateGigs < ActiveRecord::Migration
  def change
    create_table :gigs do |t|
      t.string :venue_name
      t.string :event
      t.date :date
      t.string :band
      t.time :doors
      t.time :showtime
      t.string :age
      t.string :price
      t.text :description

      t.timestamps null: false
    end
  end
end

更新了将乐队添加到gigs.rb：

class AddBandToGigs < ActiveRecord::Migration
  def change
    add_column :gigs, :band1, :string
    add_column :gigs, :band2, :string
    add_column :gigs, :band3, :string
    add_column :gigs, :band4, :string
    add_column :gigs, :band5, :string
    add_column :gigs, :band6, :string
    add_column :gigs, :band7, :string
    add_column :gigs, :band8, :string
  end
end

class AddBandToGigs < ActiveRecord::Migration
  def change
    add_column :gigs, :band, :string
  end
end

class AddBandToGigs

show.html.erb：

<div class="page-header">
  <h2>My Gigs</h2>
</div>

<% if @gigs %>
  <% @gigs.each do |gig| %>
    <div class="well">
      <p><%= gig.date %></p>
      <p><%= gig.event %>: $<%= gig.price %></p>
      <p><%= gig.band %></p>
      <p><%= gig.age %> | <%= gig.doors %> / <%= gig.showtime %></p>
      <p><%= gig.description %></p>
      <hr />
      <%= link_to time_ago_in_words(gig.created_at), gig_path(gig) %> ago
    </div>
  <% end %>
<% end %>

我的演出

:$


|/



以前

Gig.all：

Gig Load (1.0ms)  SELECT "gigs".* FROM "gigs"
  Gig Load (1.0ms)  SELECT "gigs".* FROM "gigs"
=> #<ActiveRecord::Relation [#<Gig id: 1, venue_name: nil, event: "Gigitt Launch Party", date: "2015-01-06", doors: "2000-01-01 19:00:00", showtime: "2000-01-01 21:00:00", age: "21+", price: "8", description: "Rock Your Hear Out!", created_at: "2015-05-01 21:20:46", updated_at: "2015-05-01 21:20:46", user_id: 1, band: "thrice">, #<Gig id: 2, venue_name: nil, event: "4th of July Festival", date: "2015-04-07", doors: "2000-01-01 13:00:00", showtime: "2000-01-01 21:00:00", age: "All Ages", price: "31", description: "Going To Be A Blast!", created_at: "2015-05-01 21:20:46", updated_at: "2015-05-01 21:20:46", user_id: 2, band: "pennywise">, #<Gig id: 4, venue_name: nil, event: "this is a test event", date: "2015-05-01", doors: "2000-01-01 21:30:00", showtime: "2000-01-01 21:30:00", age: "All Ages", price: "31", description: "testtest", created_at: "2015-05-01 21:31:08", updated_at: "2015-05-01 21:31:08", user_id: 1, band: nil>]>

Gig加载（1.0ms）从“Gig”中选择“Gig”。*
Gig加载（1.0ms）从“Gig”中选择“Gig”。*
=> #

gig模型：

class Gig < ActiveRecord::Base
  belongs_to :user

  validates :description, presence: true,
                          length: { minimum: 8 }

  validates :event, presence: true,
                          length: { maximum: 20 }

  validates :age, presence: true

  validates :price, presence: true,
                              length: { minimum: 1 },
                              length: { maximum: 8 }

  validates :user_id, presence: true
end

class-Gig

---

我试过运行db:migrate，它运行得很好，但是当我转到创建事件页面时，所有的信息都会在post中填写，但是对于乐队没有显示。有什么想法吗？

您是在向表中添加数据库列，而不是向表中添加数据。查看

db:seeds

，将其作为测试数据库种子的一种方法。您还可以使用Rails控制台创建少量测试数据

就为了子孙后代，问题变成了

索引

和

显示

操作和视图被纠缠在一起。一旦索引操作控制了正确的视图，它就工作得很好

class Gig < ActiveRecord::Base
  belongs_to :user

  validates :description, presence: true,
                          length: { minimum: 8 }

  validates :event, presence: true,
                          length: { maximum: 20 }

  validates :age, presence: true

  validates :price, presence: true,
                              length: { minimum: 1 },
                              length: { maximum: 8 }

  validates :user_id, presence: true
end