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improve docs 

[skip-ci] Few more lines about the syntax of predicates
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tommaso1 2018-08-27 18:02:58 +02:00 committed by GitHub
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@ -132,6 +132,11 @@ which are defined in
<% end %>
```
The argument of `f.search_field` has to be in this form:
`attribute_name[_or_attribute_name]..._predicate`
where `[_or_another_attribute_name]...` means any repetition of `_or_` plus the name of the attribute.
`cont` (contains) and `start` (starts with) are just two of the available
search predicates. See
[Constants](https://github.com/activerecord-hackery/ransack/blob/master/lib/ransack/constants.rb)