[TYPO3-mvc] Blog Example and Value Object question

[Franz Koch]

Hi,

>> But to get back to your argument. I disagree, a tag is a value object
>> because its value cannot
>> change without changing its identity. So the choice is - as far as my
>> limited understanding of DDD
>> allows me to judge - correct.
>
> You are right. A Tag is a value object. It has no concept of identity. I
> only care about its name "Fruit". And I can pass it around without
> taking care which exact "Fruit"-object you have. It has no concept of
> uniqueness or identity.

I currently have the same issue on deciding whether I make my tags 
entities or value objects. I'm asking this myself, because what if the 
tags shall be displayed as tag-cloud, what if (to stay with the blog 
example) the blog posts shall be displayed by a certain tag? Don't the 
tags itself need to have an identity to resolve the relations to the 
blog posts then? I only wonder how a "findPostsByTag" method for the 
postsRepository would work then.
And what if I'd like to change the spelling of a tag, that is shared 
across several posts (maybe because it was not the correct wording or 
misspelled and not noticed) and I want the tag to be changed for every 
related post? That would only be possible by entities, right?

-- 
kind regards,
Franz Koch

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