# Postgre Sql Full Text Search

## Description

PostgreSQL full-text search can be used as the backing implementation for Flex search operations. Your application code should depend on `IFlexSearchStore`, while Flex provides the provider bridge and wiring.

## Important concepts

* **`IFlexSearchStore` is the contract**: app code performs searches and indexing through the shared interface.
* **Search configuration**: PostgreSQL uses a text search configuration (for example `english`) to control tokenization and stemming.
* **Provider bridge**: the PostgreSQL implementation is exposed via an `IFlexSearchStoreBridge` internally, but most consumers only need `IFlexSearchStore`.

## Configuration in DI

Add the provider in your DI composition root (commonly in `EndPoints/...CommonConfigs/OtherApplicationServicesConfig.cs` or wherever you centralize registrations).

```csharp
// using Sumeru.Flex; // IFlexSearchStore

public static class OtherApplicationServicesConfig
{
	public static IServiceCollection AddOtherApplicationServices(
		this IServiceCollection services,
		IConfiguration configuration)
	{
		// Registers PostgreSQL full-text search as the IFlexSearchStore bridge.
		// Flex auto-wires generated Queries/Plugins that *use* IFlexSearchStore.
		services.AddFlexPostgreSqlSearchStore(configuration);

		return services;
	}
}
```

## appsettings.json

Configuration is read from `FlexBase:DataStores:Search:PostgreSql`.

```json
{
  "FlexBase": {
	"DataStores": {
	  "Search": {
		"PostgreSql": {
		  "ConnectionString": "Host=...;Database=...;Username=...;Password=...",
		  "SearchConfiguration": "english"
		}
	  }
	}
  }
}
```

## Examples (template-based)

These examples mirror the generated Query and PostBus plugin templates. You do **not** register these types manually—Flex discovers and wires generated Queries/Handlers/Plugins automatically.

### Search a paged list (Query)

```csharp
using Microsoft.Extensions.Logging;
using Sumeru.Flex;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace {YourApplication}.Queries.Search;

public class SearchArticlesPaged : FlexiQueryPagedListBridgeAsync<SearchArticlesPagedParams, ArticleDto, FlexAppContextBridge>
{
	protected readonly ILogger<SearchArticlesPaged> _logger;
	protected readonly IFlexHost _flexHost;
	protected readonly IFlexSearchStore _searchStore;
	protected SearchArticlesPagedParams _params;
	protected FlexAppContextBridge _flexAppContext;

	public SearchArticlesPaged(ILogger<SearchArticlesPaged> logger, IFlexHost flexHost, IFlexSearchStore searchStore)
	{
		_logger = logger;
		_flexHost = flexHost;
		_searchStore = searchStore;
	}

	public virtual SearchArticlesPaged AssignParameters(SearchArticlesPagedParams @params)
	{
		_params = @params;
		return this;
	}

	public virtual async Task<PagedResult<ArticleDto>> Fetch()
	{
		_flexAppContext = _params.GetAppContext();

		var skip = (_params.PageNumber - 1) * _params.PageSize;
		var results = await _searchStore.SearchAsync<ArticleSearchDocument>(
			_params.Query,
			skip: skip,
			take: _params.PageSize);

		var list = results.ToList();
		// TODO: map ArticleSearchDocument -> ArticleDto, and compute true totalCount if supported
		return new PagedResult<ArticleDto>
		{
			Items = list as IEnumerable<ArticleDto>,
			TotalCount = list.Count,
			PageNumber = _params.PageNumber,
			PageSize = _params.PageSize
		};
	}
}

public class SearchArticlesPagedParams : DtoBridge
{
	public string Query { get; set; }
	public int PageNumber { get; set; } = 1;
	public int PageSize { get; set; } = 20;
}

public class ArticleSearchDocument
{
	public string Id { get; set; }
}
```

## PostgreSQL considerations

* Ensure your database/table setup supports full-text indexes for your data shape.
* `SearchConfiguration` should match the language/analyzer behavior you expect (for example `simple` vs `english`).


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.flexbase.in/data-and-providers/data-stores/search-store-full-text/postgre-sql-full-text-search.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.