Allow stdlib CSV options to be passed through

README.md

@@ -159,6 +159,20 @@ bar1,bar1-description,,acb12345
 bar2,bar2-description,,xyz98765
 ```
 
+### stdlib CSV options
+If you need to pass any [options](http://docs.ruby-lang.org/en/2.0.0/CSV.html#method-c-new)
+to the underlying CSV library:
+
+
+```
+> puts (Foo.all + Bar.all).to_csv csv_options: {col_sep:'|'}
+name|description|code|barcode
+foo1|foo1-description|111|
+foo2|foo2-description|222|
+bar1|bar1-description||acb12345
+bar2|bar2-description||xyz98765
+```
+
 ## Contributing
 
 1. Fork it

as_csv.gemspec

@@ -16,6 +16,7 @@ Gem::Specification.new do |gem|
 
   gem.add_runtime_dependency "activemodel", '>= 3.0'
   gem.add_runtime_dependency "actionpack", '>= 3.0'
+  gem.add_runtime_dependency "responders"
 
   # Tests
   gem.add_development_dependency "rails", ">= 3.0"

lib/as_csv/csv_builder.rb

@@ -2,16 +2,17 @@
 
 module AsCSV
   class CSVBuilder
-    attr_reader :records, :options
+    attr_reader :records, :options, :csv_options
 
     def initialize(records, options={})
       @records = Array(records)
       @options = options
+      @csv_options = options.delete(:csv_options) || {}
       validate
     end
 
     def to_csv
-      rows.collect { |row| CSV.generate_line row }.join
+      rows.collect { |row| CSV.generate_line row, csv_options }.join
     end
 
     private

spec/dummy/config/application.rb

@@ -4,6 +4,7 @@
 
 Bundler.require
 require "as_csv"
+require "responders"
 
 module Dummy
   class Application < Rails::Application

spec/models/widget_spec.rb

@@ -18,6 +18,20 @@
     end
   end
 
+  describe 'dummy with csv options' do
+    subject(:dummy_widget) { Widget.new :name => "widget-name", :description => 'widget-description', :code => 1234 }
+
+    describe :to_csv do
+      subject { dummy_widget.to_csv(csv_options: {col_sep:'|'})}
+      it do
+        should == <<-CSV.strip_heredoc
+          id|name|description|code
+          |widget-name|widget-description|1234
+        CSV
+      end
+    end
+  end
+
   describe 'collection' do
     before do
       Widget.create! [
@@ -44,4 +58,4 @@
     end
   end
 
-end
+end