allow to match category names on import/sync

app/models/article_category.rb

@@ -12,10 +12,26 @@ class ArticleCategory < ActiveRecord::Base
 
   normalize_attributes :name, :description
 
-  validates :name, :presence => true, :uniqueness => true, :length => { :in => 2..20 }
+  validates :name, :presence => true, :uniqueness => true, :length => { :minimum => 2 }
 
   before_destroy :check_for_associated_articles
 
+  # Find a category that matches a category name; may return nil.
+  # TODO more intelligence like remembering earlier associations (global and/or per-supplier)
+  def self.find_match(category)
+    return if category.blank? or category.length < 3
+    c = nil
+    ## exact match - not needed, will be returned by next query as well
+    #c ||= ArticleCategory.where(name: category).first
+    # case-insensitive substring match (take the closest match = shortest)
+    c = ArticleCategory.where('name LIKE ?', "%#{category}%") unless c and c.any?
+    # case-insensitive phrase present in category description
+    c = ArticleCategory.where('description LIKE ?', "%#{category}%").select {|s| s.description.match /(^|,)\s*#{category}\s*(,|$)/i} unless c and c.any?
+    # return closest match if there are multiple
+    c = c.sort_by {|s| s.name.length}.first if c.respond_to? :sort_by
+    c
+  end
+
   protected
 
   # Deny deleting the category when there are associated articles.

app/models/shared_article.rb

@@ -19,6 +19,7 @@ class SharedArticle < ActiveRecord::Base
         :deposit => deposit,
         :unit_quantity => unit_quantity,
         :order_number => number,
+        :article_category => ArticleCategory.find_match(category),
         # convert to db-compatible-string
         :shared_updated_on => updated_on.to_formatted_s(:db)
     )