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Fix example for using composite columns and lookup to switch paths in a save template by adding the # to the lookup name

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Charles Haley 2016-09-12 20:32:41 +02:00
parent 6a5bf68148
commit 5f5b2d9b78
1 changed files with 3 additions and 3 deletions
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manual/template_lang.rst
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@ -457,9 +457,9 @@ The slash and the hyphen appear only if series is not empty.
The lookup function lets us do even fancier processing. For example, assume that if a book has a series, then we want the folder structure `series/series index - title.fmt`. If the book does not have a series, then we want the folder structure `genre/author_sort/title.fmt`. If the book has no genre, we want to use 'Unknown'. We want two completely different paths, depending on the value of series. The lookup function lets us do even fancier processing. For example, assume that if a book has a series, then we want the folder structure `series/series index - title.fmt`. If the book does not have a series, then we want the folder structure `genre/author_sort/title.fmt`. If the book has no genre, we want to use 'Unknown'. We want two completely different paths, depending on the value of series.
To accomplish this, we: To accomplish this, we:
1. Create a composite field (call it AA) containing ``{series}/{series_index} - {title'}``. If the series is not empty, then this template will produce `series/series_index - title`. 1. Create a composite field (give it lookup name #AA) containing ``{series}/{series_index} - {title'}``. If the series is not empty, then this template will produce `series/series_index - title`.
2. Create a composite field (call it BB) containing ``{#genre:ifempty(Unknown)}/{author_sort}/{title}``. This template produces `genre/author_sort/title`, where an empty genre is replaced with `Unknown`. 2. Create a composite field (give it lookup name #BB) containing ``{#genre:ifempty(Unknown)}/{author_sort}/{title}``. This template produces `genre/author_sort/title`, where an empty genre is replaced with `Unknown`.
3. Set the save template to ``{series:lookup(.,AA,BB)}``. This template chooses composite field AA if series is not empty, and composite field BB if series is empty. We therefore have two completely different save paths, depending on whether or not `series` is empty. 3. Set the save template to ``{series:lookup(.,#AA,#BB)}``. This template chooses composite field #AA if series is not empty, and composite field #BB if series is empty. We therefore have two completely different save paths, depending on whether or not `series` is empty.
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