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286 lines
12 KiB
Markdown
286 lines
12 KiB
Markdown
# Sieve
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⚗️ Sieve is a simple, clean, and extensible framework for .NET Core that **adds sorting, filtering, and pagination functionality out of the box**.
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Most common use case would be for serving ASP.NET Core GET queries.
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[](https://www.nuget.org/packages/Sieve)
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[Get Sieve on nuget](https://www.nuget.org/packages/Sieve/)
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## Usage for ASP.NET Core
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In this example, consider an app with a `Post` entity.
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We'll use Sieve to add sorting, filtering, and pagination capabilities when GET-ing all available posts.
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### 1. Add required services
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Inject the `SieveProcessor` service. So in `Startup.cs` add:
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```C#
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services.AddScoped<SieveProcessor>();
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```
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### 2. Tell Sieve which properties you'd like to sort/filter in your models
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Sieve will only sort/filter properties that have the attribute `[Sieve(CanSort = true, CanFilter = true)]` on them (they don't have to be both true).
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So for our `Post` entity model example:
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```C#
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public int Id { get; set; }
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[Sieve(CanFilter = true, CanSort = true)]
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public string Title { get; set; }
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[Sieve(CanFilter = true, CanSort = true)]
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public int LikeCount { get; set; }
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[Sieve(CanFilter = true, CanSort = true)]
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public int CommentCount { get; set; }
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[Sieve(CanFilter = true, CanSort = true, Name = "created")]
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public DateTimeOffset DateCreated { get; set; } = DateTimeOffset.UtcNow;
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```
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There is also the `Name` parameter that you can use to have a different name for use by clients.
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Alternatively, you can use [Fluent API](#fluent-api) to do the same. This is especially useful if you don't want to use attributes or have multiple APIs.
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### 3. Get sort/filter/page queries by using the Sieve model in your controllers
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In the action that handles returning Posts, use `SieveModel` to get the sort/filter/page query.
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Apply it to your data by injecting `SieveProcessor` into the controller and using its `Apply<TEntity>` method. So for instance:
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```C#
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[HttpGet]
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public JsonResult GetPosts(SieveModel sieveModel)
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{
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var result = _dbContext.Posts.AsNoTracking(); // Makes read-only queries faster
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result = _sieveProcessor.Apply(sieveModel, result); // Returns `result` after applying the sort/filter/page query in `SieveModel` to it
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return Json(result.ToList());
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}
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```
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You can also explicitly specify if only filtering, sorting, and/or pagination should be applied via optional arguments.
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### 4. Send a request
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[Send a request](#send-a-request)
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### Add custom sort/filter methods
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If you want to add custom sort/filter methods, inject `ISieveCustomSortMethods` or `ISieveCustomFilterMethods` with the implementation being a class that has custom sort/filter methods that Sieve will search through.
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For instance:
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```C#
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services.AddScoped<ISieveCustomSortMethods, SieveCustomSortMethods>();
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services.AddScoped<ISieveCustomFilterMethods, SieveCustomFilterMethods>();
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```
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Where `SieveCustomSortMethodsOfPosts` for example is:
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```C#
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public class SieveCustomSortMethods : ISieveCustomSortMethods
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{
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public IQueryable<Post> Popularity(IQueryable<Post> source, bool useThenBy, bool desc) // The method is given an indicator of weather to use ThenBy(), and if the query is descending
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{
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var result = useThenBy ?
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((IOrderedQueryable<Post>)source).ThenBy(p => p.LikeCount) : // ThenBy only works on IOrderedQueryable<TEntity>
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source.OrderBy(p => p.LikeCount)
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.ThenBy(p => p.CommentCount)
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.ThenBy(p => p.DateCreated);
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return result; // Must return modified IQueryable<TEntity>
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}
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public IQueryable<T> Oldest<T>(IQueryable<T> source, bool useThenBy, bool desc) where T : BaseEntity // Generic functions are allowed too
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{
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var result = useThenBy ?
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((IOrderedQueryable<T>)source).ThenByDescending(p => p.DateCreated) :
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source.OrderByDescending(p => p.DateCreated);
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return result;
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}
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}
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```
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And `SieveCustomFilterMethods`:
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```C#
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public class SieveCustomFilterMethods : ISieveCustomFilterMethods
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{
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public IQueryable<Post> IsNew(IQueryable<Post> source, string op, string[] values) // The method is given the {Operator} & {Value}
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{
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var result = source.Where(p => p.LikeCount < 100 &&
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p.CommentCount < 5);
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return result; // Must return modified IQueryable<TEntity>
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}
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public IQueryable<T> Latest<T>(IQueryable<T> source, string op, string[] values) where T : BaseEntity // Generic functions are allowed too
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{
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var result = source.Where(c => c.DateCreated > DateTimeOffset.UtcNow.AddDays(-14));
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return result;
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}
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}
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```
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## Configure Sieve
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Use the [ASP.NET Core options pattern](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options) with `SieveOptions` to tell Sieve where to look for configuration. For example:
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```C#
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services.Configure<SieveOptions>(Configuration.GetSection("Sieve"));
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```
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Then you can add the configuration:
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```json
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{
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"Sieve": {
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"CaseSensitive": "boolean: should property names be case-sensitive? Defaults to false",
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"DefaultPageSize": "int number: optional number to fallback to when no page argument is given. Set <=0 to disable paging if no pageSize is specified (default).",
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"MaxPageSize": "int number: maximum allowed page size. Set <=0 to make infinite (default)",
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"ThrowExceptions": "boolean: should Sieve throw exceptions instead of silently failing? Defaults to false"
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}
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}
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```
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## Send a request
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With all the above in place, you can now send a GET request that includes a sort/filter/page query.
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An example:
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```curl
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GET /GetPosts
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?sorts= LikeCount,CommentCount,-created // sort by likes, then comments, then descendingly by date created
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&filters= LikeCount>10, Title@=awesome title, // filter to posts with more than 10 likes, and a title that contains the phrase "awesome title"
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&page= 1 // get the first page...
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&pageSize= 10 // ...which contains 10 posts
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```
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More formally:
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* `sorts` is a comma-delimited ordered list of property names to sort by. Adding a `-` before the name switches to sorting descendingly.
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* `filters` is a comma-delimited list of `{Name}{Operator}{Value}` where
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* `{Name}` is the name of a property with the Sieve attribute or the name of a custom filter method for TEntity
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* You can also have multiple names (for OR logic) by enclosing them in brackets and using a pipe delimiter, eg. `(LikeCount|CommentCount)>10` asks if `LikeCount` or `CommentCount` is `>10`
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* `{Operator}` is one of the [Operators](#operators)
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* `{Value}` is the value to use for filtering
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* You can also have multiple values (for OR logic) by using a pipe delimiter, eg. `Title@=new|hot` will return posts with titles that contain the text "`new`" or "`hot`"
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* `page` is the number of page to return
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* `pageSize` is the number of items returned per page
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Notes:
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* You can use backslashes to escape commas and pipes within value fields
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* You can have spaces anywhere except *within* `{Name}` or `{Operator}` fields
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* If you need to look at the data before applying pagination (eg. get total count), use the optional paramters on `Apply` to defer pagination (an [example](https://github.com/Biarity/Sieve/issues/34))
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* Here's a [good example on how to work with enumerables](https://github.com/Biarity/Sieve/issues/2)
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* Another example on [how to do OR logic](https://github.com/Biarity/Sieve/issues/8)
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### Nested objects
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You can filter/sort on a nested object's property by marking the property using the Fluent API.
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Marking via attributes not currently supported.
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For example, using this object model:
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```C#
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public class Post {
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public User Creator { get; set; }
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}
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public class User {
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public string Name { get; set; }
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}
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```
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Mark `Post.User` to be filterable:
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```C#
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// in MapProperties
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mapper.Property<Post>(p => p.Creator.Name)
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.CanFilter();
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```
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Now you can make requests such as: `filters=User.Name==specific_name`.
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### Creating your own DSL
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You can replace this DSL with your own (eg. use JSON instead) by implementing an [ISieveModel](https://github.com/Biarity/Sieve/blob/master/Sieve/Models/ISieveModel.cs). You can use the default [SieveModel](https://github.com/Biarity/Sieve/blob/master/Sieve/Models/SieveModel.cs) for reference.
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### Operators
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| Operator | Meaning |
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|------------|--------------------------|
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| `==` | Equals |
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| `!=` | Not equals |
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| `>` | Greater than |
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| `<` | Less than |
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| `>=` | Greater than or equal to |
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| `<=` | Less than or equal to |
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| `@=` | Contains |
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| `_=` | Starts with |
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| `!@=` | Does not Contains |
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| `!_=` | Does not Starts with |
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| `@=*` | Case-insensitive string Contains |
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| `_=*` | Case-insensitive string Starts with |
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| `==*` | Case-insensitive string Equals |
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| `!=*` | Case-insensitive string Not equals |
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| `!@=*` | Case-insensitive string does not Contains |
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| `!_=*` | Case-insensitive string does not Starts with |
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### Handle Sieve's exceptions
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Sieve will silently fail unless `ThrowExceptions` in the configuration is set to true. 3 kinds of custom exceptions can be thrown:
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* `SieveMethodNotFoundException` with a `MethodName`
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* `SieveIncompatibleMethodException` with a `MethodName`, an `ExpectedType` and an `ActualType`
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* `SieveException` which encapsulates any other exception types in its `InnerException`
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It is recommended that you write exception-handling middleware to globally handle Sieve's exceptions when using it with ASP.NET Core.
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### Example project
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You can find an example project incorporating most Sieve concepts in [SieveTests](https://github.com/Biarity/Sieve/tree/master/SieveTests).
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## Fluent API
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To use the Fluent API instead of attributes in marking properties, setup an alternative `SieveProcessor` that overrides `MapProperties`. For example:
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```C#
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public class ApplicationSieveProcessor : SieveProcessor
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{
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public ApplicationSieveProcessor(
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IOptions<SieveOptions> options,
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ISieveCustomSortMethods customSortMethods,
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ISieveCustomFilterMethods customFilterMethods)
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: base(options, customSortMethods, customFilterMethods)
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{
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}
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protected override SievePropertyMapper MapProperties(SievePropertyMapper mapper)
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{
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mapper.Property<Post>(p => p.Title)
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.CanFilter()
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.HasName("a_different_query_name_here");
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mapper.Property<Post>(p => p.CommentCount)
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.CanSort();
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mapper.Property<Post>(p => p.DateCreated)
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.CanSort()
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.CanFilter()
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.HasName("created_on");
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return mapper;
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}
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}
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```
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Now you should inject the new class instead:
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```C#
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services.AddScoped<ISieveProcessor, ApplicationSieveProcessor>();
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```
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Find More on Sieve's Fluent API [here](https://github.com/Biarity/Sieve/issues/4#issuecomment-364629048).
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## Upgrading to v2.2.0
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2.2.0 introduced OR logic for filter values. This means your custom filters will need to accept multiple values rather than just the one.
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* In all your custom filter methods, change the last argument to be a `string[] values` instead of `string value`
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* The first value can then be found to be `values[0]` rather than `value`
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* Multiple values will be present if the client uses OR logic
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## Upgrading from v1.* to v2.*
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* Changes to the `SieveProcessor` API:
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* `ApplyAll` is now `Apply`
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* `ApplyFiltering`, `ApplySorting`, and `ApplyPagination` are now depricated - instead you can use optional arguments on `Apply` to achieve the same
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* Instead of just removing commas from `{Value}`s, [you'll also need to remove brackets and pipes](#send-a-request)
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## License & Contributing
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Sieve is licensed under Apache 2.0. Any contributions highly appreciated!
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