[openstreetmap-website] API: query changesets by ids (#608)

[Tom Hughes]

> @@ -414,6 +415,18 @@ def conditions_closed(changesets, closed)
>    end
>  
>    ##
> +  # query changesets by a list of ids
> +  # (either specified as array or comma-separated string)
> +  def conditions_ids(changesets, ids)
> +    if ids.nil? or ids.empty?
> +      return changesets
> +    else
> +      ids = ids.split(',').collect { |n| n.to_i } if ids.kind_of?(String)
> +      return changesets.where("id IN (?)", ids)

You can just do `:id => ids` here for the condition, and rails will construct an SQL IN for you.

---
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https://github.com/openstreetmap/openstreetmap-website/pull/608/files#r8108844
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