附件不会保存。我在这里缺少什么? 在我的应用程序中,我有一个项目,每个项目用户都可以上传许多资产。上传由载波完成。
这是模型
class Project < ActiveRecord::Base
has_many :assets,:as => :assetable,dependent: :destroy
accepts_nested_attributes_for :assets, :allow_destroy => true
end
class Asset < ActiveRecord::Base
belongs_to :project
belongs_to :user
belongs_to :assetable, :polymorphic => true
mount_uploader :attachment, AttachmentUploader #carrierwave
validates :attachment, presence: true
validates :project_id, presence: true
end
这些是我的project_controller中的动作
def new
@project = Project.new
@asset = @project.assets.build
end
def create
@project = Project.new(project_params)
@project.assets.build
respond_to do |format|
if @project.save
format.html { redirect_to @project, notice: 'Project was successfully created.' }
format.json { render :show, status: :created, location: @project }
else
format.html { render :new }
format.json { render json: @project.errors, status: :unprocessable_entity }
end
end
def project_params
params.require(:project).permit(:user_id, :summary, :start_date,assets_attributes: [:id, :project_id, :attachment,:user_id] )
end
这就是表单的样子
<%= form_for @project,:html => {:multipart => true } do |f| %>
<% if @project.errors.any? %>
<div id="error_explanation">
</div>
<% end %>
<%= f.fields_for :assets do |p| %>
<div class="field">
<%= p.label :attachment %><br>
<%= p.file_field :attachment,name: "assets[attachment][]" %>
</div>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
答案 0 :(得分:0)
<强> schema.rb 强>
create_table "assets", force: true do |t|
t.string "assetable_id"
t.string "assetable_type"
t.string "attachment"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "projects", force: true do |t|
t.string "user_id"
t.string "summary"
t.datetime "created_at"
t.datetime "updated_at"
end
<强>项目/ _form.html.erb 强>
<%= form_for @project, :html => {:multipart => true } do |f| %>
<% if @project.errors.any? %>
<div id="error_explanation">
<%= @project.errors.inspect %>
</div>
<% end %>
<%= f.label :summary %>
<%= f.text_field :summary %>
<%= f.fields_for :assets do |p| %>
<div class="field">
<%= p.label :attachment %><br>
<%= p.file_field :attachment %>
<%= p.hidden_field :assetable_id %>
<%= p.hidden_field :assetable_type %>
</div>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
<强> projects_controller.rb 强>
# GET /projects/new
def new
@project = Project.new
@project.assets.build
end
# POST /projects
# POST /projects.json
def create
@project = Project.new(project_params)
respond_to do |format|
if @project.save
format.html { redirect_to @project, notice: 'Project was successfully created.' }
format.json { render :show, status: :created, location: @project }
else
format.html { render :new }
format.json { render json: @project.errors, status: :unprocessable_entity }
end
end
end
private
# Never trust parameters from the scary internet, only allow the white list through.
def project_params
params.require(:project).permit(:user_id, :summary, :start_date, assets_attributes: [:id, :assetable_id, :assetable_type, :attachment, :user_id] )
end
<强> project.rb 强>
class Project < ActiveRecord::Base
has_many :assets, :as => :assetable, dependent: :destroy
accepts_nested_attributes_for :assets, :allow_destroy => true
end
<强> asset.rb 强>
class Asset < ActiveRecord::Base
belongs_to :project
belongs_to :assetable, :polymorphic => true
mount_uploader :attachment, AttachmentUploader #carrierwave
validates :attachment, presence: true
validates :assetable_type, presence: true
end
<强>除了强>
由于您根据上一个问题提出了这个问题,您只是提到:如果您希望资产类的实例属于不同类型的类(即其他类似的东西),您只想使用多态关联而不是一个项目)。