# Dynamic field behaviour

## Feature

Use dynamic fields controlled by you in code

Useful when use a unified collection and isolate your tenant by a prefix/suffix in each field

## How to

1. You need prepare your SOLR collection with dynamic fields, to do this, follow steps in [**SOLR wiki**](https://cwiki.apache.org/confluence/display/solr/Dynamic+Fields)
2. Choose one or more approachs:

   2.1. Using global settings (see \</tutorials/global-settings> to more informations), than all searchs will use **prefix** and/or **suffix** setted in global settings (useful when you know your tenant in app startup)

   2.1.1. Set global settings

   ```csharp
        services
            .AddSolrExpress<TechProduct>(builder => builder
                .UseOptions(options =>
                {
                    // ... Other settings
                    options.GlobalDynamicFieldPrefix = "my_prefix_",
                    options.GlobalDynamicFieldSuffix = "_my_suffix"
                })
                // ...  Other settings
                );
   ```

   2.1.2. Optionally, set global settings for specific field

   ```csharp
        using SolrExpress.Search.Behaviour.Extension;

        services.AddSolrExpress<TechProduct>(q => q
            .ChangeDynamicFieldBehaviour(q => q.Manufacturer, prefixName: "my_prefix_", suffixName: "_my_suffix")
            // ...  Other settings
            );
   ```

   2.1.3. Change your class that represent your collection, extend **Document** (see \</tutorials/getting-started> to more informations), set dynamic field in **SolrFieldAttribute**, like below:

   ```csharp
    public class MyDocument : Document
    {
        [SolrField("myfield_s", IsDynamicField = true)]
        public string MyField { get; set; }
    }
   ```

   2.2. Using settings to each search, than only this search will use **prefix** and/or **suffix** (useful when you know your tenant only in after some process)

   2.2.1. Set settings in your search

   ```csharp
        using SolrExpress.Search.Behaviour.Extension;

        DocumentSearch<TechProduct> documentSearch; // From your DI provider
        documentSearch
            .ChangeDynamicFieldBehaviour(q => q.Manufacturer, prefixName: "my_prefix_", suffixName: "_my_suffix")
            // ...  Other settings
            .Execute();
   ```

   2.2.2. Change your class that represent your collection, extend **Document** (see \</tutorials/getting-started> to more informations), set dynamic field in **SolrFieldAttribute**, like below:

   ```csharp
        public class MyDocument : Document
        {
            [SolrField("myfield_s", IsDynamicField = true)]
            public string MyField { get; set; }
        }
   ```

   2.3. Using settings to each field, than all searchs will use **prefix** and/or **suffix** setted in field settings (useful when you know your tenant in hard code)

   2.3.1. Change your class that represent your collection, extend **Document** (see \</tutorials/getting-started> to more informations), set settings in **SolrFieldAttribute**, like below:

   ```csharp
        public class MyDocument : Document
        {
            [SolrField("myfield_s", IsDynamicField = true, DynamicFieldPrefixName = "my_prefix_", DynamicFieldSuffixName = "_my_suffix")]
            public string MyField { get; set; }
        }
   ```

&#x20;**NOTE**&#x20;

See another example in issue [**206**](https://github.com/solr-express/solr-express/issues/206#issuecomment-294005085);