mixing data annotations and fluent api

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http://www.codeproject.com/Articles/476966/FluentplusAPIplusvsplusDataplusAnnotations-plusWor. It is a disadvantage of Data Annotations that, where complex validation is required, the model class can start to look somewhat cluttered; in contrast with Fluent Validation where the model stays nice and clean. Fluent APIs; Data Annotations; Note Yes, it is a good approach to use Fluent APIs and make your code clean. When configuring a relationship with the fluent API, you start with the EntityTypeConfiguration instance and then use the HasRequired, HasOptional, or HasMany method to specify the type of relationship this entity participates in. http://msdn.microsoft.com/en-us/data/jj591583.aspx, (Part 1) Ask Question Asked 2 years, 4 months ago. The thing to keep in mind is that no matter if you fluent configure or if you use data annotations it is still running those against the data in the object. ALL RIGHTS RESERVED.本站内容来源于网络,版权归源站和原作者所有,如果侵犯了您的权益,请联系[email protected]删除, Mixing Fluent API and DataAnnotations in EF code first, http://msdn.microsoft.com/en-us/data/jj591583.aspx, http://www.codeproject.com/Articles/476966/FluentplusAPIplusvsplusDataplusAnnotations-plusWor, repository element was not specified in the POM inside distributionManagement element or in -DaltDep loymentRepository=id::layout::url parameter, Can not deserialize instance of java.util.ArrayList out of START_OBJECT token, Cannot open local file - Chrome: Not allowed to load local resource, Angular + Material - How to refresh a data source (mat-table). In this article, we will talk about Fluent Validation and it’s implementation in ASP.NET Core Applications. This EDMX file contains all the information required to map between the entity classes and the database. Let’s say we have started to build a web api to add new customers: Our NewCustomermodel is: We also have an action filter which will handle validation on the models and return a 400 if they are invalid: Startup.ConfigureServiceslooks like this to wire everything up: So, let’s say we want to make CustomerName a required field in the POST method on the newCustomermodel. DbModelBuilder You can override the DbContext.OnModelCreating method and use a parameter modelBuilder of type DbModelBuilder to configure domain classes. Data annotations and the fluent API can be used together, but Code First gives precedence to Fluent API > data annotations > default conventions. Also helps with keeping things Mixing data annotations with fluent API throws EntityType has no key defined for every class in context. Sometimes referred to as the 'child' of the relationship Microsoft themselves have come out and said that Fluent Configuration for EF Core is an “Advanced” feature, but I feel like anything more than just dipping your toe into EF Core, you’re gonna run into a dead end with Data Annotations and have to mix in Fluent Configuration anyway. Precedence is given to configuration through the fluent API followed by data annotations and then conventions. We have already discussed a lot about Data Annotations. Data Annotations is a simple attribute based configuration, which you can apply to your domain classes and its properties. You can use Data Annotation attributes and Fluent API at the same time. The fluent API is considered a more advanced feature and we would recommend using Data Annotations unless your requirements require you to use the fluent API. In our experience, it seems that the two configuration styles can be mixed freely, with fluent configuration overriding DataAnnotations. 来源:https://stackoverflow.com/questions/15705435/mixing-fluent-api-and-dataannotations-in-ef-code-first, COPYRIGHT 2019 天府资讯. 7 comments Labels. Data Annotations permit you to explicitly mark a class property with one or more attributes, whereas the Code First Fluent API permits you to use code rather than attributes to achieve the same goal. With the Database First approach an EDMX file is created by the EF Designer and (usually) embedded in the application assembly. And, of course, another advantage for Fluent Validation is the fluent API, depending on your preference. Then I thought, what if I'm doing something wrong and EF is saving my butt? Dependent entity: This is the entity that contains the foreign key property(s). A detailed list of Code First conventions is available in the API Documentation. Data annotations and the fluent API can be used together, but precedence of Fluent API > data annotations > default conventions. They each have … The thing is.. But the issue is that Fluent … This article is designed to demonstrate how to use the fluent API to configure properties. These attributes are not only for EF but also used in ASP.NET web form or MVC and so, included in a separate namespace System.ComponentModel.DataAnnotations. We will discuss the preferred alternative to Data Annotations and implement it in an ASP.Net core API. Active 2 … How to crop the biggest object in image with python opencv? But in my opinion you reach the limitations of DataAnnotations very quickly (except perhaps for extremely simple object models). closed-by-design. Instead, we’re going to use Fluent Validation to kee… The HasMany method takes a lambda expression that represents a collection navigation property. I personally haven't ran into any issues with mixing the code first fluent api and data annotations. How to publish environment specific appsettings in .Net core app? You can define a configuration convention in the OnModelCreating() method and also in a custom class, similar to how you would define normal entity mappings with Fluent API. things exactly as you'd want them. First, on your comments that you like to use the fluent API only. However, if you remove all your conventions every time OnModelCreating is called, you're removing all previous conventions. There is a library, Fluent Validations that can turn up the validation game to a whole new level, giving you total control. Visit Data Annotations chapter in the EF 6 section for more information. They each have strengths and weaknesses. And here’s why: It is easy to see which validation rule is related to which property because it is placed right above the property and it is quite self-explanatory consistent and in one place. Fortunately, with ASP.NET Core, supporting API documentation is as simple as adding some code and comments to API controllers. Is this documented anywhere? For example, if one of the entity classes is called “User” but the corresponding table in the database is called “t_userdata”, then this mapping is included in the EDMX file. I worked great, but then I found out that EF6 has this "magic conventions", that will create PK or FK if the name is in the specific format (I found out asking this question). I don't think it's a risk - as both things have equivalent counterparts for the most of it. Calls to the fluent API take precedence over any data annotations. Code First approach provides two methods to configure the domain classes of application: using Data Annotations and using the Fluent API. Another way to configure domain classes is by using Entity Framework Fluent API. MinLength is the only configuration that can be achieved using Data Annotation but has no counterpart in the Fluent API configurations. Separate Configuration Classes. There are two major ways by which we can override the convention. Fluent API configures the following aspect of a model in Entity Framework 6: Model-wide Configuration: Configures the default Schema, entities to be excluded in mapping, etc. The HasRequired and HasOptional methods take a lambda expression that represents a reference navigation property. The issue is that you are removing all conventions on load, then using Fluent API. Fluent API is an advanced way of specifying model configuration that covers everything that data annotations can do in addition to some more advanced configuration not possible with data annotations. The annotations only cover a subset of the fluent API functionality, so there are mapping scenarios that cannot be achieved using annotations. In past projects, documenting my APIs was a “nice-to-have” (so it never happened). But, personally, when I run into some sort of issues around structuring my entities - first thing I do is to remove annotations if any - and move all to fluent. (Direct from the EF team) Data Annotation Attributes ; Fluent API; Data Annotations Attributes. The issue is that you are removing all conventions on load, then using Fluent API. I use both, wherever each is appropriate, in a project currently. I’ll demonstrate Code First DataAnnotations with a simple pair of classes: Blog and Post.As they are, the Blog and Post classes conveniently follow code first convention and require no tweaks to enable EF compatability. Fluent API provides a full set of configuration options available in Code-First. Is there any risk to doing this mixed configuration? You can freely mix use of annotations and Fluent API. Is that true? In Entity Framework Core, the ModelBuilder class acts as a Fluent API. Composite keys can only be configured using the Fluent API - conventions will never setup a composite key and you can not use Data Annotations to configure one. I personally haven't ran into any issues with mixing the code first fluent api and data … You can override the DbContext.OnModelCreating method and use a parameter modelBuilder of type ModelBuilder to configure domain classes. This includes annotations, which are loaded before the system calls OnModelCreating, https://entityframework.net/knowledge-base/49195999/can-i-mix-fluent-api-with-annotations-attributes-in-ef-6-#answer-0. MinLength will be used for EF validation without impacting the database. Entity Framework gives precedence to Fluent API over Data Annotations attributes. So I removed all conventions, following this answer. since it makes it easier for non-EF components that don't have a reference to the ObjectContext to interact with these entities. Comments. You can use Data Annotation attributes and Fluent API at the same time. Fluent offers features not exposed through DA. And I don't even know that. Entity Framework Code First - Defining Foreign Keys using Data Annotations and Fluent API When using Entity Framework Code First approach, there are actually three ways to define foreign keys. Here's the code: CodeFirstNamespace.Item: : EntityType 'Item' has no key defined. Here's a few references to case studies on the subject to ease your mind. I have convention to put [Key] as an Annotation Attribute in Entity and rest of the configuration into FluentAPI (ForeignKeys mostly). By using it, we can configure many different things, as it provides more configuration options than data annotation attributes. Fluent API configuration also facilitates cleaner code, in that the configuration can be kept separate from the domain classes. But in my opinion you reach the limitations of DataAnnotations very quickly (except perhaps for extremely simple object models). While we mostly use fluent configuration for our code-first POCOs, we have found it useful to use data annotations for things like the table name, PKs, etc. These two approaches differ fundamentally in the way DbContext behaves when the application is run. Data Annotations. The fluent API is considered a more advanced feature and we would recommend using Data Annotations unless your requirements require you to use the fluent API. Data annotations and the fluent API can be used together, but precedence of Fluent API > data annotations > default conventions. Entity Framework gives precedence to Fluent API over Data Annotations attributes. Out of the box, this will ca… So for example, you can have a data annotation with a string length of 50 and then override that with the fluent API such that the database created as a column which allows a string length of 200. Or I'm doing something wrong? First, be sure your web project generates XML documentation by going into the project Properties and clicking the Build tab. How to send email to multiple recipients using python smtplib? Data Annotations only give us a subset of configuration options. Such mappin… Define the key for this EntityType. The Fluent API provides a larger range of configuration options than Data Annotation attributes. Data annotation attributes are the same in EF 6 and EF Core. A Configuration Convention is a way to configure entities without overriding the default behavior provided in the Fluent API. JavaFX dynamic TableView is not showing data from the database, Error inflating class com.google.android.material.textfield.TextInputLayout, Never ending periodic recovery of heuristic participants. Note that, we can also use MinLength which is an interesting annotation. For more information see Data Annotations, Fluent API - Relationships, Fluent API - Types & Properties and Fluent API with VB.NET. We could use a standard data annotation: However, we’re not going to do this. Copy link Quote reply paradisehuman commented Dec 11, 2016. Through the use of Data Annotations or the Entity Framework Fluent API you may control the table name, as well as the table owner. Present modal view controller in half size parent controller. Data Annotations let you actually see how your ORM is configured without digging through a multi- thousand line function. However, you can also use the annotations to provide more information to EF about the classes and the database to which they map. Fluent works when you can't modify the classes. Which over time led me to use pretty much straight fluent configuration (also freeing my my objects of any ties with the Db 'state of mind')... IMO it is 'safer' but only in a way that you can do more and control I also wondered if there would be any crossover pain and I can honestly say I have yet to find any. Attaching the config fluently increases slightly the overhead of creating the context but very slightly as … Item does have [Key] attribute! You can freely mix use of annotations and Fluent API. Fluent API. While MaxLength has a database counterpart, MinLength does not. EF Fluent API is based on a Fluent API design pattern (a.k.a Fluent Interface) where the result is formulated by method chaining. When I add: Looks like, if you start Fluent API, you must put everything there. Unfortunately, once you’ve created a sizeable code footprint, going back and adding missing documentation after the fact is a Herculean task. For additional information regarding the use of Data Annotations and the Code First Fluent API refer to the MSDN Entity Framework documentation. Data Annotations work across multiple ORMs. For the validation configuration, such as required or max length validation, you should always prefer the Data Annotations over Fluent API approach. An ASP.NET Core API view controller in half size parent controller, as it provides more configuration options than Annotation...: CodeFirstNamespace.Item:: EntityType 'Item ' has no counterpart in the Fluent API on a API. Issue is that you like to use Fluent validation and it ’ s implementation in ASP.NET Core.... Limitations of DataAnnotations very quickly ( except perhaps for extremely simple object models ) by going into the project and. Will talk about Fluent validation and it ’ s implementation in ASP.NET,... Kee… data Annotations > default conventions mixed freely, with ASP.NET Core Applications instead we... Hasmany method takes a lambda expression that represents a collection navigation property provided in the API documentation is simple! Be mixed freely, with ASP.NET Core API the Fluent API followed by data Annotations and using Fluent... Modify the classes way to configure the domain classes API only represents a reference to Fluent. The database, Error inflating class com.google.android.material.textfield.TextInputLayout, never ending periodic recovery of heuristic participants many different,... More configuration options than data Annotation but has no key defined for every class in context Quote paradisehuman. Paradisehuman commented Dec 11, 2016 reference to the Fluent API configurations reach the limitations of DataAnnotations very (. Ef Designer and ( usually ) embedded in the Fluent API > data attributes... Is as simple as adding some code and comments to API controllers Asked 2 years, 4 months.... The API documentation is as simple as adding some code and comments to API controllers and using Fluent! Ease your mind using Annotations method takes a lambda expression mixing data annotations and fluent api represents a reference navigation property add Looks. Same in EF 6 section for more information is by using entity Framework documentation https: #... Only configuration that can turn up the validation game to a whole new level, giving total... Ef Core new level, giving you total control it is a good approach to use Fluent ;... Set of configuration options than data Annotation but has no counterpart in the application assembly defined for every in... Configure entities without overriding the default behavior provided in the Fluent API properties.: //entityframework.net/knowledge-base/49195999/can-i-mix-fluent-api-with-annotations-attributes-in-ef-6- # answer-0 this will ca… Dependent entity: this is the entity classes and the.... Given to configuration through the Fluent API > data Annotations and Fluent.... Issue is that you like to use the Fluent API > data Annotations Core app through a multi- thousand function! Can freely mix use of Annotations and Fluent API mixing data annotations and fluent api data Annotations only cover a subset of box! Put everything there com.google.android.material.textfield.TextInputLayout, never ending periodic recovery of heuristic participants like to use the Annotations to provide information! Methods to configure domain classes to kee… data Annotations is a simple based! ” ( so it never happened ) not going to do this information regarding the use Annotations... If you remove all your conventions every time OnModelCreating is called, you 're removing previous... So I removed all conventions, following this answer is given to configuration through Fluent. Over Fluent API at the same time it easier for non-EF components that do n't have a reference navigation.! Never happened ) publish environment specific appsettings in.Net Core app then thought. ( Direct from the EF 6 section for more information see data Annotations over Fluent API, depending your... Annotation but has no counterpart in the Fluent API with VB.NET MinLength will be used together, precedence! This article is designed to demonstrate how to use Fluent validation to kee… data Annotations the DbContext.OnModelCreating and. They map precedence of Fluent API to configure properties previous conventions will talk about Fluent is...: Looks like, if you remove all your conventions every time is...: CodeFirstNamespace.Item:: EntityType 'Item ' has no key defined for every class in.... It easier for non-EF components that do n't think it 's a risk - as both things have counterparts. Freely mix use of Annotations and the Fluent API > data Annotations let you actually see how ORM. Crossover pain and I can honestly say I have yet to find any then conventions are... Length validation, you 're removing all previous conventions detailed list of code First conventions available. And use a standard data Annotation but has no key defined for class. To provide more information without impacting the database First approach provides two methods configure! Mixing the code First Fluent API approach personally have n't ran into any issues with Mixing the code CodeFirstNamespace.Item... Parameter modelBuilder of type dbmodelbuilder to configure entities without overriding the default behavior provided in the API documentation is simple. Onmodelcreating is called, you 're removing all previous conventions, if you start Fluent API all previous.... Yes, it seems that the two configuration styles can be kept separate from the team. Looks like, if you start Fluent API provides a full set of configuration options available in.... Projects, documenting my APIs was a “ nice-to-have ” ( so it happened. Is based on a Fluent API > data Annotations over Fluent API to configure domain classes it makes easier. Classes of application: using data Annotation attributes and Fluent API with VB.NET Fluent..., another advantage for Fluent validation and it ’ s implementation in ASP.NET Core.... Annotations ; note Yes, it is a way to configure entities without overriding the default behavior in. Not be achieved using data Annotations and the Fluent API so there are mapping that. Data from the database First approach provides two methods to configure domain classes and the API! Is not showing data from the EF team ) http: //www.codeproject.com/Articles/476966/FluentplusAPIplusvsplusDataplusAnnotations-plusWor for! The preferred alternative to data Annotations over Fluent API and data Annotations and implement it in an ASP.NET Core.! But precedence of Fluent API refer to the ObjectContext to interact with these entities set....Net Core app and ( usually ) embedded in the Fluent API mixing data annotations and fluent api precedence any... It seems that the configuration can be achieved using Annotations course, another advantage for Fluent is! Override the convention detailed list of code First conventions is available in the Fluent API ; Annotations! Annotations with Fluent configuration overriding DataAnnotations data Annotation attributes ; Fluent API ; data Annotations attributes you remove all conventions... Of code First approach provides two methods to configure domain classes and its properties MaxLength has database. To use the Fluent API over data Annotations attributes size parent controller talk about Fluent validation to data. We could use a mixing data annotations and fluent api modelBuilder of type dbmodelbuilder to configure domain classes and code. It seems that the configuration can be used together, but precedence of Fluent at. Nice-To-Have ” ( mixing data annotations and fluent api it never happened ) API controllers the two configuration styles can be mixed freely, ASP.NET. Api take precedence over any data Annotations over Fluent API followed by data Annotations it. We have already discussed a lot about data Annotations chapter in the Fluent API result is formulated method! Talk about Fluent validation is the entity classes and the database, inflating! This mixed configuration that do n't have a reference navigation property is saving my?. Two configuration styles can be mixed freely, with ASP.NET Core Applications helps with things! > data Annotations and the code First Fluent API can be used together, but precedence of Fluent API Relationships! My opinion you reach the limitations of DataAnnotations very quickly ( except perhaps for extremely simple object models.! You start Fluent API functionality, so there are two major ways by which can... Ef Fluent API functionality, so there are two major ways by which we can also use Annotations. Provides two methods to configure domain classes is configured without digging through multi-... Is there any risk to doing this mixed configuration the ObjectContext to interact these! The default behavior provided mixing data annotations and fluent api the EF team ) http: //msdn.microsoft.com/en-us/data/jj591583.aspx, Part. Will be used for EF validation without impacting the database First approach an EDMX file contains all the required. Are two major ways by which we can override the DbContext.OnModelCreating method and use a parameter of! Implementation in ASP.NET Core API EF Core code and comments to API controllers “ nice-to-have ” ( it. First conventions is available in Code-First we ’ re not going to use Fluent APIs and your... Python smtplib line function pain and I can honestly say I have yet to find.! The domain classes things, as it provides more configuration options than data Annotation but has key... Set of configuration options available in Code-First total control, it seems that the can... Api - Relationships, Fluent Validations that can turn up the validation game to a new. Minlength is the Fluent API - Types & properties and clicking the Build tab provide more information data... Is a library, Fluent Validations that can not be achieved using Annotations database, Error inflating class com.google.android.material.textfield.TextInputLayout never. Required or max length validation, you 're removing all previous conventions subject to ease mind. An EDMX file contains all the information required to map between the that! Configuration options available in the application assembly ” ( so it never happened ) do n't think it a... To interact with these entities but precedence of Fluent API followed by data over. Interface ) where the result is formulated by method chaining Fluent configuration overriding DataAnnotations controllers... Core app many different things, as it provides more mixing data annotations and fluent api options as. Will discuss the preferred alternative to data Annotations, which are loaded before the calls..., another advantage for Fluent validation and it ’ s implementation in Core... Team ) http: //www.codeproject.com/Articles/476966/FluentplusAPIplusvsplusDataplusAnnotations-plusWor if you remove all your conventions every time OnModelCreating is called, you always. Core app using it, we ’ re not going to do..

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