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Originally Posted by Pinecone
I was playing with importing books and merging the data.
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The merge code is mine, so I'll help if I can.
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If I reimport a book that is in Calibre, and it merges the data, it doesn't replace the actual book.
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Correct. This is import, not merge, but there is an automerge option of mine that is off by default. If the automerge option is on (Import/Export|Adding Books|If books with similar author title found ...") then it will add any new formats and ignore any pre-existing formats. Metadata is ignored. Calibre has a design philosophy of trying to make it hard to inadvertently overwrite existing books.
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If I save a book to disk, and import the book from one source, and reimport the saved book, the metadata doesn't return.
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If you have the option on to save opf file (contains metadata) and the cover, then it will bring that metadata/cover data with it, provided that it's making a new record. It won't make a new record if you already have that book and you have the automerge option on.
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If I just reimport the book from the saved copy, I get the metadata.
So what is actually happening?
It seems like not much.
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Metadata only comes in with a book when a new record is created. You're really asking an import question, not a merge question. Once the metadata is in Calibre, you can merge the record with another record, and that process merges the metadata. If you already have a book, and you want to bring in new metadata or a duplicate existing format for that book, turn off automerge, say yes when it asks if you want to create a duplicate record, then manually merge the records.