Question

我正在尝试增加列并在创建项目时更新属性：

def items_create
  @categories = Category.all
  @item = Item.new(item_params)
  @item.store_id = current_store.id
  @item.update(account_id: current_store.account.id)
  @search_suggestion = SearchSuggestion.where(term: [@item.title])
  @search_suggestion.update_attributes(:items_count => +1 )

respond_to do |format|
  if @item.save
    format.html { redirect_to store_items_index_path(current_store), notice: 'Item was successfully created.' }
    format.json { render :template => "stores/items/show", status: :created, location: @item }
  else
    format.html { render :template => "stores/items/new" }
    format.json { render json: @item.errors, status: :unprocessable_entity }
  end
 end
end

我找到了对象：

 CACHE SearchSuggestion Load (0.0ms)  SELECT  "search_suggestions".* FROM "search_suggestions" WHERE "search_suggestions"."term" = 'Rolex' LIMIT $1  [["LIMIT", 11]]

但是我收到了这个错误：

NoMethodError (undefined method `update_attributes' for #<ActiveRecord::Relation []>
Did you mean?  update_all):

任何想法我可能做错了什么？

Answer 1

where返回集合。使用find或@search_suggestion.last.update_attributes

@search_suggestion = SearchSuggestion.find_by(term: @item.title.downcase)
if @search_suggestion.present?
  @search_suggestion.increment!(:items_count)
end

Answer 2

返回对象集合的位置。要更新对象，我们需要object.So

的实例

@search_suggestion = SearchSuggestion.find_or_creat_by_term(@item.title)

update_attributes适用于对象的实例。此外，您还可以使用update_attribute：

@search_suggestion.update_attribute(:items_count, @search_suggestion.items_count +=1 ) if @search_suggestion.exist?

Answer 3

增加你可以尝试这个

@search_suggestion.increment!(:items_count)

所以代码看起来像

def items_create
  @categories = Category.all
  @item = Item.new(item_params)
  @item.store_id = current_store.id
  @item.save!
  @item.update(account_id: current_store.account.id)
  @search_suggestion = SearchSuggestion.find_by_term(@item.title)
  @search_suggestion.increment!(:items_count) if @search_suggestion.present? 

respond_to do |format|
  if @item.save
    format.html { redirect_to store_items_index_path(current_store), notice: 'Item was successfully created.' }
    format.json { render :template => "stores/items/show", status: :created, location: @item }
  else
    format.html { render :template => "stores/items/new" }
    format.json { render json: @item.errors, status: :unprocessable_entity }
  end
 end
end

Rails：增加列并更新属性

3 个答案: