Report Card

Write your domain-specific reporting code and let Report Card take care of the rest. Report Card allows your user to generate CSVs from a list of available reports. CSVs are generated in the background, uploaded to your store via CarrierWave, and emailed to the requester when ready.

• Rails
• CarrierWave
• Sidekiq

# app/reports/purchase_performance_report.rb
class PurchasePerformanceReport < ReportCard::Report
  def to_csv(csv)
    csv << %w[
      name
      email
      quantity_purchased
      order_total
    ]

    Order.find_each do |order|
      csv << [
        order.name,
        order.email,
        order.line_items.count,
        order.total.to_f
      ]
    end
  end
end

With reports defined in app/reports, you can navigate to /report_cards/reports in your browser to begin generating reports.

# in your view
<%= link_to 'Reports', report_card_reports_path %>

Use proc instead of string for recipient_email and flash_success in case they need to be evaluated. They will be evaluated within the controller instance. For instance, proc { current_admin.email }

# config/initializers/report_card.rb
ReportCard.parent_controller = 'Admin::BaseController'
ReportCard.recipient_email = proc { current_admin.email }
ReportCard.from_email = 'support@mysite.com'
ReportCard.subject = 'Your report is ready'
ReportCard.body = 'Download your report: '
ReportCard.flash_success = proc { 'Generating report. It will be emailed to you.' }

Report Card uses reports, which are simple classes that inherit from ReportCard::Report. To define a report, implement the to_csv method, which accepts a single argument, an empty CSV handle.

class CustomReport < ReportCard::Report
  def to_csv(csv)
  end
end

Add rows to the csv argument as arrays, which will be written to a CSV using Ruby's CSV class.

def to_csv(csv)
  csv << ['Name', 'Email']
  User.find_each do |user|
    csv << [user.name, user.email]
  end
end

The params hash of the request that initiated the report is also available from within a Report, which can be used to limit the scope of the report.

def to_csv(csv)
  user = User.find params[:user_id]
  csv << ['ID', 'Title']
  user.posts.each do |post|
    csv << [post.id, post.title]
  end
end

The easiest way to create and send reports is via the automatically-generated route, /report_card/reports. Issuing an HTTP GET request will return an index of all the reports available for generation, and issuing a POST request will actually create and send a report.

To specify which report to send, include the name of a Report subclass in the params with report_name as the key.

<%= link_to 'Generate Report', report_card_reports_path(report_name: 'CustomReport'), method: :post %>

After the report is created, the user will be redirected to the previous page.

Reports can also be manually created from a custom controller by creating an instance of ReportCard::Runner directly, then calling perform_async to kick off the Sidekiq job. The recipient email set in the Report Card defaults will not be automatically merged into the params hash, so it will need to be manually provided.

ReportCard::Runner.perform_async(
  report_name: 'CustomReport',
  email_options: { recipient_email: params[:email] }
)

Report Card uses CarrierWave to upload and store the generated reports. It can be additionally configured to customize where the reports are saved. For example, to save all reports to Amazon S3, you would need to install the fog gem, then configure CarrierWave itself:

CarrierWave.configure do |config|
  config.storage = :fog
  config.fog_credentials = {
    provider:              'AWS',
    aws_access_key_id:     'xxx',
    aws_secret_access_key: 'yyy',
    region:                'us-west-2'
  }
  config.fog_directory  = 'name_of_directory'
  config.fog_public     = true
  config.fog_attributes = { cache_control: "max-age=#{1.year.to_i}" }
end

For additional information and options, see CarrierWave's documentation.