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在Rails中,如何将记录作为csv文件返回

csv ruby-on-rails

Eric · 技术社区 · 16 年前

我有一个称为“entries”的简单数据库表:

class CreateEntries < ActiveRecord::Migration
  def self.up
    create_table :entries do |t|
      t.string :firstName
      t.string :lastName
      #etc.
      t.timestamps
    end
  end

  def self.down
    drop_table :entries
  end
end

如何编写一个将条目表的内容作为csv文件返回的处理程序(理想情况下,它将在Excel中自动打开)?

class EntriesController < ApplicationController

  def getcsv
    @entries = Entry.find( :all )

    # ??? NOW WHAT ????

  end

end

10 回复 | 直到 16 年前

Brian 16 年前

Clinton Dreisbach 16 年前

FasterCSV

def render_csv(filename = nil)
  filename ||= params[:action]
  filename += '.csv'

  if request.env['HTTP_USER_AGENT'] =~ /msie/i
    headers['Pragma'] = 'public'
    headers["Content-type"] = "text/plain" 
    headers['Cache-Control'] = 'no-cache, must-revalidate, post-check=0, pre-check=0'
    headers['Content-Disposition'] = "attachment; filename=\"#{filename}\"" 
    headers['Expires'] = "0" 
  else
    headers["Content-Type"] ||= 'text/csv'
    headers["Content-Disposition"] = "attachment; filename=\"#{filename}\"" 
  end

  render :layout => false
end

respond_to do |wants|
  wants.csv do
    render_csv("users-#{Time.now.strftime("%Y%m%d")}")
  end
end

generate_csv

UserID,Email,Password,ActivationURL,Messages
<%= generate_csv do |csv|
  @users.each do |user|
    csv << [ user[:id], user[:email], user[:password], user[:url], user[:message] ]
  end
end %>

Eric 16 年前

this wiki page

require 'fastercsv'

class EntriesController < ApplicationController

  def getcsv
      entries = Entry.find(:all)
      csv_string = FasterCSV.generate do |csv| 
            csv << ["first","last"]
            entries.each do |e|
              csv << [e.firstName,e.lastName]
            end
          end
          send_data csv_string, :type => "text/plain", 
           :filename=>"entries.csv",
           :disposition => 'attachment'

  end


end

rwc9u 16 年前

require "csv"

Ryan Bate's Advanced Search Form

  def show
    @advertiser_search = AdvertiserSearch.find(params[:id])
    @advertisers = @advertiser_search.search(params[:page])
    respond_to do |format|
      format.html # show.html.erb
      format.csv  # show.csv.erb
    end
  end

<%- headers = ["Id", "Name", "Account Number", "Publisher", "Product Name", "Status"] -%>
<%= CSV.generate_line headers %>
<%- @advertiser_search.advertisers.each do |advertiser| -%>
<%- advertiser.subscriptions.each do |subscription| -%>
<%- row = [ advertiser.id,
            advertiser.name,
            advertiser.external_id,
            advertiser.publisher.name,
            publisher_product_name(subscription),
            subscription.state ] -%>
<%=   CSV.generate_line row %>
<%- end -%>
<%- end -%>

<%= link_to "Export Report", formatted_advertiser_search_path(@advertiser_search, :csv) %>

kch 16 年前

FasterCSV

gem install fastercsv
gem install spreadsheet-excel

FasterCSV.generate(:col_sep => ";", :row_sep => "\r\n") { |csv| ... }

CSV_FIELDS = %w[ title created_at etc ]
FasterCSV.generate do |csv|
  Entry.all.map { |r| CSV_FIELDS.map { |m| r.send m }  }.each { |row| csv << row }
end

JasonTrue 16 年前

csv_string = FasterCSV.generate do |csv|
  csv << ["row", "of", "CSV", "data"]
  csv << ["another", "row"]
# ...
end

rantler 12 年前

def index
  respond_to do |format|
    format.csv { return index_csv }
  end
end

def index_csv
  send_data(
    method_that_returns_csv_data(...),
    :type => 'text/csv',
    :filename => 'export.csv',
    :disposition => 'attachment'
  )
end

Henry Jacob 12 年前

https://github.com/crafterm/comma

paul 12 年前

https://github.com/paulspringett/csv_shaper

boulder_ruby 11 年前

tags = [Model.column_names]
rows = tags + Model.all.map(&:attributes).map(&:to_a).map { |m| m.inject([]) { |data, pair| data << pair.last } }
File.open("ss.csv", "w") {|f| f.write(rows.inject([]) { |csv, row|  csv << CSV.generate_line(row) }.join(""))}