ransack gem rails

ransack主要用于搜索

用法

<div class="form-input-hr">
<%= text_field_tag("query[name_cont]", params["query"] && params["query"]["name_cont"]) %>
</div>

products = Product.ransack(params[:query])
@sort = params[:sort].blank? ? 'id' : params[:sort]
@order = params[:order].blank? ? 'desc' : params[:order]
if @order == 'desc'
@next_order = 'asc'
else
@next_order = 'desc'
end
@products = paginate(products.result.includes(:shop).order("#{@sort} #{@order}"))

*_eq - equal
*_not_eq - not equal
*_matches - matches with LIKE, e.g. q[email_matches]=%@gmail.com
Also: *_does_not_match, *_matches_any, *_matches_all, *_does_not_match_any, *_does_not_match_all
*_lt - less than
*_lteq - less than or equal
*_gt - greater than
*_gteq - greater than or equal
*_present - not null and not empty, e.g. q[name_present]=1 (SQL: col is not null AND col != '')
*_blank - is null or empty. (SQL: col is null OR col = '')
*_null, *_not_null - is null, is not null
*_in - match any values in array, e.g. q[name_in][]=Alice&q[name_in][]=Bob
*_not_in - match none of values in array
*_lt_any, *_lteq_any, *_gt_any, *_gteq_any - Compare to list of values, at least positive. (SQL: col > value1 OR col > value2)
*_matches_any, *_does_not_match_any - same as above but with LIKE
*_lt_all, *_lteq_all, *_gt_all, *_gteq_all - Compare to list of values, all positive. (SQL: col > value1 AND col > value2)
*_matches_all, *_does_not_match_all - same as above but with LIKE
*_not_eq_all - none of values in a set
*_start, *_not_start, *_start_any, *_start_all, *_not_start_any, *_not_start_all - start with, (SQL: col LIKE 'value%')
*_end, *_not_end, *_end_any, *_end_all, *_not_end_any, *_not_end_all - end with, (SQL: col LIKE '%value')
*_cont, *_cont_any, *_cont_all, *_not_cont, *_not_cont_any, *_not_cont_all - contains value, using LIKE
*_true, *_false - is true and is false
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原文链接：https://blog.csdn.net/tang05709/java/article/details/79507620