Check empty? of variable for Case/When

rubyonrails-talk
1

I have this:

2

I don't understand what you mean, can you be more explicit?

Colin

3

sorry..: P I meant this:

I have a record saved in the @collection variable i.e. @collection = Collection.find(1)

I'm using nokogiri parser to add content of certain tag in the collection into a new Article.. it happen sometimes that a field of the article is not available in the collection..so I need to check before to "case" if it's not empty

So I have for istance:

Collection {name:string, title_tag:string, content_tag:string, author_tag:string, ... } Article{title:string,content:text,author:string, ... }

in the parser i want to add (dynamically) the collections tags associated to Articles field

I'm not sure that each of the Collection field_tag is given.. and before to do

Case 'TAG'    When 'TAGNAME'

I'd want to check if the tag_field attribute is empty or not

I guess something like this:

   case child.name         *unless @collection.location_tag.empty?*          when @collection.location_tag            @article.location = child.content         *unless @collection.content_tag.empty?*          when @collection.content_tag            @article.content = child.content         *unless @collection.docno_tag.empty?*          when @collection.docno_tag            @article.docno = child.content         *unless @collection.date_tag.empty?*          when @collection.date_tag            temp_date = child.content      end

but I hope exists a better way to do that instead using "unless" (I'm not even sure it works..)

did i make it clearer? hope so.. :slight_smile: thx

4

The most obvious thing that comes to mind is that if "child.name" isn't empty, it's never going to much an empty tag attribute...

5

sorry..: P I meant this:

I have a record saved in the @collection variable i.e. @collection = Collection.find(1)

I'm using nokogiri parser to add content of certain tag in the collection into a new Article.. it happen sometimes that a field of the article is not available in the collection..so I need to check before to "case" if it's not empty

So I have for istance:

Collection {name:string, title_tag:string, content_tag:string, author_tag:string, ... } Article{title:string,content:text,author:string, ... }

in the parser i want to add (dynamically) the collections tags associated to Articles field

I'm not sure that each of the Collection field_tag is given.. and before to do

Case 'TAG' When 'TAGNAME'

I'd want to check if the tag_field attribute is empty or not

I guess something like this:

case child.name *unless @collection.location_tag.empty?*

You don't need to test for empty? because if it is empty it will never match in the 'when' (unless child.name is also empty which presumably it is not)

Colin

6

Thanks, in this way is much easier :smiley: Merry xmas btw :wink: