salsify / arc-furnace Goto Github PK
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License: MIT License
Need to melt, weave, and meld information together? Arc furnace will fuse anything you've got.
License: MIT License
In many cases the ArcFurnace nodes expect rows that come in to have certain fields--this is especially true for Hash
and Equijoin
nodes. These nodes should be resilient to missing data and properly log when expectations are not met instead of failing with a stacktrace (which they often do).
One of our projects has a ProductPipeline
that is a relatively simple implementation of the library. Here's a snippet:
require_relative 'constants'
require 'arc-furnace/pipeline'
require 'arc-furnace/excel_source'
require 'arc-furnace/all_fields_csv_sink'
class ProductsPipeline < ArcFurnace::Pipeline
include Constants
# create products source
source :products_source,
type: ArcFurnace::ExcelSource,
params: {
filename: :product_filename,
encoding: 'ISO-8859-1'
}
transform :products_transform, params: { source: :products_source } do |hash|
result = hash.deep_dup
result[SALSIFY_ID] = result.delete(BLAH_ID)
result
end
filter :filtered_products, params: { source: :products_transform, observed_products: :observed_products } do |row, params|
params.fetch(:observed_products).add(row[BLAH_ID])
end
sink type: ArcFurnace::AllFieldsCSVSink,
source: :filtered_products,
params: { filename: "#{Dir.pwd}/products_import.csv" }
end
The source file is a 14 MB XLSX file, but the output file is a 71 MB CSV file. The output file is five times larger and XLSX files tend to be larger than CSV files relative to the information contained. I tried removing the filter and the file size was the same, and I spot checked the file and they look identical. I feel like something is going wrong with the AllFieldsCSVSink
.
Queue @dspangen
If there are no columns found matching the join key column, arc furnace should throw an error and not continue to process the file.
In the case of an equijoin the transform process finishes with no errors but it's dropped all rows on the floor and won't produce an output.
There's no documentation on how to use or add to arc-furnace aside from the one basic example
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