Global LINQ Filters

Global LINQ Filters

This is for:

Developer System Administrator

Coveo for Sitecore 4.1 (November 2018)

The Global LINQ Filters allow the creation of filters to be applied to every query that’s executed through the LINQ layer. This can be used to globally limit search results based on security or templates.

To define a Global LINQ Filter, follow these steps:

1. Create a new class that inherits from the Sitecore.ContentSearch.Pipelines.QueryGlobalFilters.ApplyGlobalLinqFilters class. Override the GetQuery virtual method and apply your custom logic, as shown in the following code sample:

    using Sitecore.ContentSearch.Pipelines.QueryGlobalFilters;
    namespace Coveo.Custom
    {
        public class CustomGlobalFilter : ApplyGlobalLinqFilters
        {
            protected override object GetQuery(QueryGlobalFiltersArgs args)
            {
                // Filter search results by keeping only those that have been created in the last 3 days.
                IQueryable<SearchResultItem> query = (IQueryable<SearchResultItem>)args.Query;
                query = query.Where(item => item.CreatedDate > DateTime.Now.AddDays(-3));
                return query;
            }
        }
    }
   

2. Open your Coveo.SearchProvider.Custom.config configuration file and add the following lines in the <pipelines> XML element:

    <contentSearch.getGlobalLinqFilters>
      <processor type="Coveo.Custom.GlobalQueryFilter, Coveo.Custom" />
    </contentSearch.getGlobalLinqFilters>
   

3. Open LinqScratchPad (typically located under http://SitecoreInstanceName/sitecore/admin/LinqScratchPad.aspx) in your browser and execute a query to validate that the Global LINQ filter is working as expected.