Module: Plutonium::Resource::Controllers::ExportCsv

Extended by:
ActiveSupport::Concern
Included in:
Plutonium::Resource::Controller
Defined in:
lib/plutonium/resource/controllers/export_csv.rb

Overview

Streams the current resource collection as a CSV download.

Auto-mounted on every Plutonium resource via the interactive_resource_actions routing concern (see Plutonium::Routing::MapperExtensions). Gated by the export_csv? policy method, which defaults to false — export is strictly opt-in (enable it by overriding export_csv? to return true).

The exported rows are exactly the index's filtered collection (filtered_resource_collection) — same search, filters, scope, and tenant/parent scoping — but NOT paginated: every matching record is exported. Rows are streamed (a lazy Enumerator body + find_each) so memory stays flat regardless of row count.

Columns come from policy.permitted_attributes_for_export (defaults to the index columns), with the primary key always prepended as the first column. Per-field output and headers are customizable through the definition's export DSL.

find_each iterates in primary-key order, so the file does not preserve the index's current sort (filters/search/scope still apply).

Streaming uses a lazy Enumerator response body rather than send_stream — the latter lives in ActionController::Live, which would turn every resource action into a threaded streaming response. The Enumerator body streams through Rack on its own.

Constant Summary collapse

INVALID_COLUMN =

Placeholder written when a column is neither an export block nor a real attribute on the record, so the export degrades to a usable file instead of a mid-stream NoMethodError (which would truncate the already-committed download).

"<<invalid column>>"

Instance Method Summary collapse

Instance Method Details

#export_csv ⇒ Object

GET //export_csv



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# File 'lib/plutonium/resource/controllers/export_csv.rb', line 52

def export_csv
  response.headers["Content-Type"] = "text/csv; charset=utf-8"
  response.headers["Content-Disposition"] =
    ActionDispatch::Http::ContentDisposition.format(disposition: "attachment", filename: export_csv_filename)
  # Defeat proxy/`Rack::ETag` buffering so rows flush as they're read.
  response.headers["X-Accel-Buffering"] = "no"
  response.headers["Cache-Control"] = "no-cache"

  self.response_body = export_csv_lines
end