Rails:如何使用具有HABTM关系的多个选择标记设置表单

# post.rb
class Post< ApplicationRecord
  has_and_belongs_to_many :tags
end

# tag.rb
class Tag< ApplicationRecord
  has_and_belongs_to_many :posts
end

rails generate migration CreatePostsTagsJoinTable post:references tag:references

rails db:migrate

def post_params
  params.require(:post).permit(:title, :content, tag_ids: [])
end

<%= form_with(model: post, local: true) do |form| %>
  <!-- 其他表单字段 -->

  <%= form.label :tag_ids, 'Tags' %>
  <%= form.collection_check_boxes :tag_ids, Tag.all, :id, :name do |tag| %>
    <%= tag.label(class: 'checkbox-inline') do %>
      <%= tag.check_box(class: 'form-check-input') %>
      <%= tag.text %>
    <% end %>
  <% end %>

  <%= form.submit %>
<% end %>

def create
  @post = Post.new(post_params)
  # ...
end

def update
  @post.assign_attributes(post_params)
  # ...
end