我正在尝试从.csv文件导入产品列表，但无法将csv文件中的数据导入MySQL数据库。在csv产品文件上，有7列，分别是产品代码，说明和尺寸。 (Please click to see the expample)来自表Product本身。其他列来自其他表格，分别是颜色，类别代码，供应商和单位。我的问题是，它会在“产品代码”字段中不断插入“ CSV导入07/23/2018 05:06 PM ”（或任何时间/日期）。它应该是CSV文件中的产品代码值（例如100778）。但该消息表明它已成功(here)导入，但数据库上没有任何变化。您认为这里的问题是什么？
这是我的模特：
product.rb：
class Product < ApplicationRecord
require 'csv'
belongs_to :category, optional:true
belongs_to :supplier, optional:true
belongs_to :color, optional:true
belongs_to :unit, optional:true
accepts_nested_attributes_for :serial, allow_destroy: true
validates :product_code, presence: true, uniqueness: true
def import file
status = true
message = ""
last_location = ""
color_id, unit_id, category_id, supplier_id = ""
index = 2
CSV.foreach(file.path, headers: true) do |row|
if row["Product Code"].nil? || row["Product Code"].blank?
status = false
message = "Error: Product Code is required on row #{index}."
break
elsif row["Category Code"].nil? || row["Category Code"].blank?
status = false
message = "Error: Category Code is required on row #{index}."
break
elsif row["Supplier"].nil? || row["Supplier"].blank?
status = false
message = "Error: Supplier is required on row #{index}."
break
elsif row["Unit"].nil? || row["Unit"].blank?
status = false
message = "Error: Supplier is required on row #{index}."
break
else
stock_no = row["Product Code"].to_s.downcase.strip
product = Product.where("LOWER(product_code) = '#{stock_no}'").first
if product.nil?
status = false
message = "Error: No matching item #{stock_no} on row #{index}."
break
end
color_name = row["Color"].to_s.downcase.strip
color = Color.where("LOWER(name) = '#{color_name}'").first
if color.nil?
status = false
message = "Error: No matching color #{color_name} on row #{index}."
break
end
category_name = row["Category Code"].to_s.downcase.strip
category = Category.where("LOWER(name) = '#{category_name}'").first
if category.nil?
status = false
message = "Error: No matching category #{category_name} on row #{index}."
break
end
supplier_name = row["Supplier"].to_s.downcase.strip
supplier = Supplier.where("LOWER(name) = '#{supplier_name}'").first
if supplier.nil?
status = false
message = "Error: No matching supplier #{supplier_name} on row #{index}."
break
end
unit_name = row["Unit"].to_s.downcase.strip
unit = Unit.where("LOWER(name) = '#{unit_name}'").first
if unit.nil?
status = false
message = "Error: No matching unit on row #{index}."
break
end
end
index += 1
last_location = row["Location"]
end
if status
imported = 0
color = Color.where(["LOWER(name) = ?", 'row[color]'.downcase]).first
color_id = color.nil? ? nil : color.id
unit = Unit.where(["LOWER(name) = ?", 'row[unit]'.downcase]).first
unit_id = unit.nil? ? nil : unit.id
category = Category.where(["LOWER(name) = ?", 'row[category]'.downcase]).first
category_id = category.nil? ? nil : category.id
supplier = Supplier.where(["LOWER(name) = ?", 'row[supplier]'.downcase]).first
supplier_id = supplier.nil? ? nil : supplier.id
product = Product.new product_code: "CSV Import #{Time.zone.now.strftime('%m/%d/%Y %I:%M %p')}", color_id: color_id, category_id: category_id, supplier_id: supplier_id, unit_id: unit_id
if product.save
CSV.foreach(file.path, headers: true) do |row|
product = Product.where(["LOWER(product_code) = ?", row["Product Code"].downcase]).first
unless product.nil?
product = Product.new product_code: product.id, color: color_id.id, category_id: category_id, supplier_id: supplier_id, unit_id: unit_id
if product.save
imported += 1
end
end
end
message = "#{imported} record(s) have been imported successfully."
end
end
return [status, message]
end
end
products_controller.rb：
class ProductsController < ApplicationController
def create
@product = Product.new(product_params)
if params[:todo] == "import"
import = Product.import params[:product][:file]
session[:import_flash] = import[1]
if import[0]
redirect_to import_product_path
else
redirect_to import_product_path
end
else
@product = Product.new(product_params)
if @product.save
redirect_to products_path, notice: "Product created successfully."
else
flash.now[:error] = "#{@product.errors.full_messages.first}."
render :new
end
end
end
def product_params
params.require(:product).permit(
:product_code, :description, :size, :barcode, :color_id, :unit_id, :category_id, :supplier_id, :qty, :price,
:serial_attributes => [:id, :serial_no, :power, :serial_type, :cyl, :product_id,:_destroy]
)
end
end
import_product_csv.js：
function validateProductCSV(param) {
if (param == "product") {
var file = document.getElementById("product_file");
}
else {
var file = document.getElementById("product_file");
}
p_error = document.getElementById("p_error");
no_errors = true;
err_mes = "";
if (file.value == "") {
no_errors = false;
err_mes = "CSV file is required.";
}
ext = file.value.split('.').pop();
if ((ext != "csv" && ext != "CSV") && no_errors) {
no_errors = false;
err_mes = "Selected file is not a valid CSV.";
}
if (no_errors) {
return true;
}
else {
p_error.innerHTML = err_mes;
file.focus();
return false;
}
}
视图： import.html.erb：
<%= form_for Product.new do |f| %>
<div class="header">
<h4 class="title"> <%= link_to "Products", products_path %> / Import
<%= f.submit "Import", class:"btn btn-flat btn-flat pull-right", data:{disable_with:"Importing.."}, style:"color:#000000;", onclick: "return validateProductCSV('product');" %></h4>
</div>
<br><br>
<%= render "form_import", f:f %>
<% end %>
（表单） _form_import.html.erb：
<%= javascript_include_tag "import_product_csv" %>
<div class="content">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<div class="card">
<div class="card-content">
<div class="content">
<div class="row">
<div class="col-md-12">
<p style="font-family:'Calibri'; font-size:12pt; color:red; font-weight:bold; padding-left:15px;" id="p_error"><%= session[:import_flash] %></p>
<% session[:import_flash] = nil %>
<div class="box box-primary">
<div class="box-body">
<div class="form-group">
<div class="col-md-4">
<%= f.label :name, "Choose a CSV file" %>
<%= f.file_field :file, class:'form-control' %>
<input type="hidden" name="todo" value="import">
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
答案 0 :(得分：0)
您正在此行中将product_code设置为“ CSV导入...”
product = Product.new product_code: "CSV Import #{Time.zone.now.strftime('%m/%d/%Y %I:%M %p')}", color_id: color_id, category_id: category_id, supplier_id: supplier_id, unit_id: unit_id
您应该更改此位
product_code: row["Product Code"].to_s.downcase.strip
我不明白这部分的目的
if product.save
CSV.foreach(file.path, headers: true) do |row|
product = Product.where(["LOWER(product_code) = ?", row["Product Code"].downcase]).first
unless product.nil?
product = Product.new product_code: product.id, color: color_id.id, category_id: category_id, supplier_id: supplier_id, unit_id: unit_id
if product.save
imported += 1
end
end
在方法开始时，我将import =设置为0，然后执行
if product.save
imported += 1
end