Class: Mensa::Tables::ExportsController

Inherits:
ApplicationController
  • Object
show all
Defined in:
app/controllers/mensa/tables/exports_controller.rb

Overview

Lists a user’s available downloads for a table and creates new export requests. Generating the CSV happens asynchronously in Mensa::ExportJob; both the export button badge and the downloads list are refreshed via Turbo streams once the job completes.

Instance Method Summary collapse

Instance Method Details

#create ⇒ Object

Creates a new export for the current user and enqueues the job that generates and attaches the CSV.



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# File 'app/controllers/mensa/tables/exports_controller.rb', line 19

def create
  export = Mensa::Export.new(
    table_name: params[:table_id],
    table_view_id: params[:table_view_id].presence,
    user: current_mensa_user,
    format: params[:export_format].to_s.presence_in(Mensa::Export::FORMATS) || "csv_excel",
    scope: params[:scope].to_s.presence_in(Mensa::Export::SCOPES) || "all",
    config: params.permit(:query, :page, order: {}, filters: {}).to_h,
    status: "pending"
  )

  if export.save
    Mensa::ExportJob.perform_later(export)

    respond_to do |format|
      format.turbo_stream { render turbo_stream: [list_stream, badge_stream] }
      format.json { render json: {id: export.id}, status: :created }
    end
  else
    respond_to do |format|
      format.turbo_stream { head :unprocessable_entity }
      format.json { render json: {errors: export.errors.full_messages}, status: :unprocessable_entity }
    end
  end
end

#download ⇒ Object

Streams the generated CSV and then removes the export, purging the attached asset. Downloads are single-use: routing them through the controller (instead of a direct Active Storage link) gives us a hook to delete the Mensa::Export record and free the stored file afterwards.



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# File 'app/controllers/mensa/tables/exports_controller.rb', line 49

def download
  export = exports.find(params[:id])
  return head :not_found unless export.downloadable?

  data = export.asset.download
  filename = export.asset.filename.to_s.presence || export.filename.presence || "#{export.table_name}_export.csv"
  content_type = export.asset.content_type.presence || "text/csv"

  send_data data, filename: filename, type: content_type, disposition: "attachment"

  # Clean up after a successful send. `has_one_attached :asset` purges the
  # blob when the record is destroyed (dependent: :purge_later). Never let
  # cleanup failures break the download itself.
  begin
    export.destroy
    Mensa::Export.broadcast_refresh(export.table_name, export.user)
  rescue => e
    Mensa.config.logger&.warn("Mensa::Export cleanup failed for #{export.id}: #{e.class}: #{e.message}")
  end
end

#index ⇒ Object

Returns the current downloads list for the table, used to refresh the contents of the export dialog when it is opened.



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# File 'app/controllers/mensa/tables/exports_controller.rb', line 10

def index
  respond_to do |format|
    format.turbo_stream { render turbo_stream: list_stream }
    format.html { render partial: "mensa/exports/list", locals: list_locals }
  end
end