Adds basic support for queries generated by #find_by_sql
#33
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Relates to #32 Allows exporting data that was generated by [find_by_sql][]. This can be desirable when the caller is required to export a calculated field that is not stored directly on the table as demonstrated below. ```ruby User.find_by_sql("SELECT id, 'custom_value' AS custom_field FROM users") ArtVandelay::Export.new(export).csv ``` As such, this feature does not support the `in_batches_of` option, since that would be the responsibility of the query. This feature also does not (yet) support the `attributes` option. [find_by_sql]: https://api.rubyonrails.org/classes/ActiveRecord/Querying.html#method-i-find_by_sql
The previous commit failed to account for the case where `#find_by_sql` returns no results.
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Relates to #32
Allows exporting data that was generated by find_by_sql. This can be desirable when the caller is required to export a calculated field that is not stored directly on the table as demonstrated below.
As such, this feature does not support the
in_batches_ofoption, sincethat would be the responsibility of the query.
This feature also does not (yet) support the
attributesoption.