BikeCsvImporter: add import of brands as a separate step

app/models/bike_csv_importer.rb

@@ -28,6 +28,7 @@ class BikeCsvImporter
     fetch do |bike_hash|
        bike         = new_bike bike_hash
        check_method = dry_run ? :valid? : :save
+
        if bike.try check_method
          puts "Imported #{bike.shop_id}: #{bike}".green
 
@@ -76,6 +77,34 @@ class BikeCsvImporter
     end
   end
 
+  # Imports new brands from CSV file (field 'make'). Will print out progress to stdout
+  #
+  # @param [Boolean] dry_run If true, does not save data, only shows the progress of validation
+  def brands(dry_run)
+    created_count, skipped_count = 0, 0
+
+    puts "Performing a #{dry_run ? 'DRY RUN' : 'LIVE RUN'} of brands import"
+
+    fetch do |bike_hash|
+      make          = clean_value bike_hash['make']
+      brand         = bike_attr_bike_brand make, true
+      check_method  = dry_run ? :valid? : :save
+
+      if brand.try :persisted?
+        puts "Skipped already existing brand #{brand.brand}"
+        skipped_count +=1
+      elsif brand.try check_method
+        puts "Created brand #{brand.brand}".green
+        created_count += 1
+      else
+        puts "Skipped #{brand.try(:brand) || make}: #{brand.try(:errors).try(:full_messages).try(:join, '; ') || 'object not created'}".red
+        skipped_count += 1
+      end
+    end
+
+    puts "#{created_count} brand created, #{skipped_count} brand skipped, total of #{created_count + skipped_count} rows in the CSV"
+  end
+
 
 
   private

app/models/bike_csv_importer/bike_attrs.rb

@@ -20,7 +20,7 @@ class BikeCsvImporter
 
     def bike_attrs(bike_hash)
       bike_attr_fields.each_with_object({}) do |(model_field, csv_field), memo|
-        memo[model_field] = send :"bike_attr_#{ model_field }", clean_value(bike_hash[csv_field])
+        memo[model_field] = send :"bike_attr_#{model_field}", clean_value(bike_hash[csv_field])
       end
     end
 
@@ -52,9 +52,13 @@ class BikeCsvImporter
       value.try(:gsub, /[$]/, '').try :to_i
     end
 
+    def bike_attr_bike_brand(value, new_if_empty = false)
+      value = 'Unknown' if !value || value =~ /\Aunknown/i
+      cached_bike_brand value, new_if_empty
+    end
+
     def bike_attr_bike_brand_id(value)
-      return unless value
+      bike_attr_bike_brand(value, false).try :id
-      cached_bike_brand(value).try :id
     end
 
     def bike_attr_bike_model_id(value)

app/models/bike_csv_importer/cache.rb

@@ -6,12 +6,15 @@ class BikeCsvImporter
       @bike_purpose_cache[purpose]  ||= BikePurpose.find_by_purpose purpose
     end
 
-    def cached_bike_brand(brand)
+    def cached_bike_brand(brand, new_if_empty = false)
       @bike_brand_cache ||= {}
       if @bike_brand_cache.has_key? brand
         @bike_brand_cache[brand]
       else
-        @bike_brand_cache[brand] = BikeBrand.where('lower(brand) = ?', brand.downcase).first
+        bike_brand   = BikeBrand.where('lower(brand) = ?', brand.downcase).first
+        bike_brand ||= BikeBrand.new(brand: brand) if new_if_empty
+
+        @bike_brand_cache[brand] = bike_brand
       end
     end
 

lib/tasks/import.rake

@@ -21,5 +21,16 @@ namespace :import do
       next puts "File #{file} does not exist or is unreachable" unless File.readable? file
       BikeCsvImporter.new(file).analyze field ? [field] : []
     end
+
+    # Imports new brands from CSV file
+    #
+    #   rake import:bikes:brands_csv[import.csv,dry] # dry run
+    #   rake import:bikes:brands_csv[import.csv]     # live import
+    task :brands_csv, [:file, :dry_run] => :environment do |t, args|
+      file, dry_run = args.values_at :file, :dry_run
+      next puts "Usage: rake #{t.name}[$csv_file_path[,$dry_run=dry]]" unless file
+      next puts "File #{file} does not exist or is unreachable" unless File.readable? file
+      BikeCsvImporter.new(file).brands dry_run == 'dry'
+    end
   end
 end