我有一个类,用于渲染一些从 AbstractController 继承的 pdf,我想在视图中使用 cache_digests
class PDFExporter < AbstractController::Base
include AbstractController::Rendering
include ActionView::Layouts
include AbstractController::Helpers
include AbstractController::Translation
include AbstractController::AssetPaths
include AbstractController::Callbacks
helper ApplicationHelper, FormatterHelper, FontAwesome::Rails::IconHelper
view_paths << "app/views"
TMP_PATH = File.join(Rails.root, "tmp")
PDFTK_PATH = "/usr/bin/pdftk"
LAYOUT = "pdf.html.erb"
COVER = "shared/pdf_cover.html.haml"
MARGINS = {top: 17, left: 0, right: 0, bottom: 9.5}
def self.save_pdf_file(pdf)
file = Tempfile.new("pdf", encoding: "ASCII-8BIT")
file.write(pdf)
file
end
protected
def generate_pdf(templates)
partials = generate_partials(templates)
output = File.join(TMP_PATH, "#{filename}.pdf")
paths = partials.map(&:path).join(" ")
system("#{PDFTK_PATH} #{paths} cat output #{output}")
partials.map(&:unlink)
output
end
private
def generate_partials(templates)
templates.map do |template|
partial = send("partial_#{template.shift}", *template)
PDFExporter.save_pdf_file(partial)
end
end
def partial_content(template)
rendered = render(template: template, layout: LAYOUT)
WickedPdf.new.pdf_from_string(rendered,
orientation: "Landscape",
margin: MARGINS,
header: {
spacing: 3,
content: render_to_string("shared/pdf_header.pdf.haml",
layout: LAYOUT)
},
footer: {
content: render_to_string("shared/pdf_footer.pdf.haml",
layout: LAYOUT)
}
)
end
def partial_cover(template = COVER)
rendered = render(template: template, layout: LAYOUT)
WickedPdf.new.pdf_from_string(rendered, orientation: "Landscape",
margin: MARGINS, header: nil, footer: nil)
end
end
当我尝试cache
在视图中调用时
- cache [@fund, @fund_sheet.report_date] do
我得到:
undefined method `perform_caching' for #<FundSheet::Exporter:0x0000000e128e10>
我试图在其中包含一些缓存模块,但我可以让它工作