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attachment_helper.rb
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attachment_helper.rb
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module Refile
# Rails view helpers which aid in using Refile from views.
module AttachmentHelper
# Form builder extension
module FormBuilder
# @see AttachmentHelper#attachment_field
def attachment_field(method, options = {})
self.multipart = true
@template.attachment_field(@object_name, method, objectify_options(options))
end
end
# View helper which generates a url for an attachment. This generates a URL
# to the {Refile::App} which is assumed to be mounted in the Rails
# application.
#
# Optionally the name of a processor and a arguments to it can be appended.
#
# If the filename option is not given, the filename falls back to the
# `name`.
#
# The host defaults to {Refile.host}, which is useful for serving all
# attachments from a CDN. You can also override the host via the `host`
# option.
#
# Returns `nil` if there is no file attached.
#
# @example
# attachment_url(@post, :document)
#
# @example With processor
# attachment_url(@post, :image, :fill, 300, 300, format: "jpg")
#
# @param [Refile::Attachment] record Instance of a class which has an attached file
# @param [Symbol] name The name of the attachment column
# @param [String, nil] filename The filename to be appended to the URL
# @param [String, nil] format A file extension to be appended to the URL
# @param [String, nil] host Override the host
# @return [String, nil] The generated URL
def attachment_url(record, name, *args, filename: nil, format: nil, host: nil)
file = record.send(name)
return unless file
filename ||= name.to_s
backend_name = Refile.backends.key(file.backend)
host = host || Refile.host || request.base_url
filename = filename.parameterize("_")
filename << "." << format.to_s if format
::File.join(host, main_app.refile_app_path, backend_name, *args.map(&:to_s), file.id.to_s, filename)
end
# Generates an image tag for the given attachment, adding appropriate
# classes and optionally falling back to the given fallback image if there
# is no file attached.
#
# Returns `nil` if there is no file attached and no fallback specified.
#
# @param [String] fallback The path to an image asset to be used as a fallback
# @param [Hash] options Additional options for the image tag
# @see #attachment_url
# @return [ActiveSupport::SafeBuffer, nil] The generated image tag
def attachment_image_tag(record, name, *args, fallback: nil, format: nil, host: nil, **options)
file = record.send(name)
classes = ["attachment", record.class.model_name.singular, name, *options[:class]]
if file
image_tag(attachment_url(record, name, *args, format: format, host: host), options.merge(class: classes))
elsif fallback
classes << "fallback"
image_tag(fallback, options.merge(class: classes))
end
end
# Generates a form field which can be used with records which have
# attachments. This will generate both a file field as well as a hidden
# field which tracks the id of the file in the cache before it is
# permanently stored.
#
# @param object_name The name of the object to generate a field for
# @param method The name of the field
# @param [Hash] options
# @option options [Object] object Set by the form builder, currently required for direct/presigned uploads to work.
# @option options [Boolean] direct If set to true, adds the appropriate data attributes for direct uploads with refile.js.
# @option options [Boolean] presign If set to true, adds the appropriate data attributes for presigned uploads with refile.js.
# @return [ActiveSupport::SafeBuffer] The generated form field
# @ignore
# rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
def attachment_field(object_name, method, object:, **options)
options[:data] ||= {}
attacher = object.send(:"#{method}_attacher")
options[:accept] = attacher.accept
if options[:direct]
host = options[:host] || Refile.host || request.base_url
backend_name = Refile.backends.key(attacher.cache)
url = ::File.join(host, main_app.refile_app_path, backend_name)
options[:data].merge!(direct: true, as: "file", url: url)
end
if options[:presigned] and attacher.cache.respond_to?(:presign)
options[:data].merge!(direct: true).merge!(attacher.cache.presign.as_json)
end
html = hidden_field(object_name, method, value: attacher.data.to_json, object: object)
html + file_field(object_name, method, options)
end
end
end