docs(pinia-orm): adapt STI docs to be more correctly

resolves #1629, resolves #1630, resolves #1631

docs/content/1.guide/2.model/7.single-table-inheritance.md

@@ -15,6 +15,7 @@ In order to define inheritance in Pinia ORM, you need to follow some conventions
 1. Make sure the sub-entity class extends another Pinia ORM Model class.
 2. Add a reference to the base entity name along with the `static entity` reference.
 3. Call `super.fields()` in the `static fields` method to make sure to merge the sub-entity fields with the base one.
+4. If you don't want your model to be saved in a different store also define `static types` and set a `type` property if your data passed to the instance are not having it (its recommended always to set it)
 
 ```js
 // Base entity.
@@ -43,13 +44,15 @@ class Adult extends Person {
 }
 ```
 
+Be aware that this example will save `adult` in a seperate store `adult`. If you want to have it saved in `person` continue reading.
+
 ::alert{type="info"}
 For typescript look at this [discussion](https://github.com/CodeDredd/pinia-orm/discussions/325)
 ::
 
 ## Interacting with Data
 
-Once you defined a sub-class, you can `insert` / `create` / `update` / `get` / `delete` entities using the Model static methods. For instance, to create or insert data:
+Once you defined a sub-class, you can `insert` / `create` / `update` / `get` / `delete` entities using the Repository static methods. For instance, to create or insert data:
 
 ```js
 useRepo(Adult).insert({id: 1, name: 'John Doe', job: 'Software Engineer' })
@@ -68,21 +71,6 @@ const adults = useRepo(Adult).all()
 */
 ```
 
-You can also fetch mixed results using the base entity getter:
-
-```js
-const people = useRepo(Person).all()
-
-/* 
-[
-  Person { id: 1, name: 'John Doe' },
-  Adult { id: 2, name: 'Jane Doe', job: 'Software Engineer' }
-]
-*/
-```
-
-However, using only these, you need to use the sub-entity methods (like `Adult.insert` in our example) if you want to insert sub-entity. If you want to deal with mixed data from the same hierarchy, you may use a "Discriminator Field" to dispatch entity using the base entity methods.
-
 ## Discriminator Field
 
 When defining an inheritance model, one can use a discriminator field to dispatch entities based on this field value when inserting data using the base entity `insert` or `create` method.  
@@ -216,6 +204,8 @@ Note that if the `static fields` method doesn't expose the discriminator field (
 // Base entity.
 class Person extends Model {
   static entity = 'person'
+
+  // static typeKey = 'person_type' // If your type field is not `type`
 
   static types () {
     return {
@@ -229,6 +219,7 @@ class Person extends Model {
       id: this.attr(null),
       name: this.attr(''),
       type: this.attr('PERSON') // Exposing the discriminator field.
+      // person_type: this.attr('PERSON') // If your type field is not `type`
     }
   }
 }
@@ -243,6 +234,7 @@ class Adult extends Person {
       ...super.fields(),
       job: this.attr(''),
       type: this.attr('ADULT') // necessary fallback if you use the childRepo directly without type
+      // person_type: this.attr('ADULT') // If your type field is not `type`
     }
   } 
 }
@@ -266,6 +258,30 @@ const people = useRepo(Person).all()
 */
 ```
 
+You also need to set the `type` field if you want to save data without its `type` property but by store
+
+````ts
+useRepo(Adult).insert([
+    { id: 2, name: 'Jane Doe', job: 'Software Engineer' }
+  ])
+
+useRepo(Person).insert([
+  { id: 1, name: 'John Doe' }
+])
+
+/* 
+[
+  Person { id: 1, name: 'John Doe', type: 'PERSON' },
+  Adult { id: 2, name: 'Jane Doe', job: 'Software Engineer', type: 'ADULT' }
+]
+*//* 
+[
+  Person { id: 1, name: 'John Doe', type: 'PERSON' },
+  Adult { id: 2, name: 'Jane Doe', job: 'Software Engineer', type: 'ADULT' }
+]
+*/
+````
+
 ## Relationship Handling
 
 Inheritance handles relation as any field:
@@ -279,12 +295,20 @@ Querying related data using the `with` keyword (see [this page](/guide/relations
 class Person extends Model {
   static entity = 'person'
 
+  static types () {
+    return {
+      PERSON: Person,
+      ADULT: Adult
+    }
+  }
+
   static fields () {
     return {
       id: this.attr(null),
       home_address_id: this.attr(null),
       name: this.attr(''),
       home_address: this.belongsTo(Address, 'home_address_id'),
+      type: this.attr('PERSON')
     }
   }
 }
@@ -300,6 +324,7 @@ class Adult extends Person {
       work_address_id: this.attr(null),
       job: this.attr(''),
       work_address: this.belongsTo(Address, 'work_address_id'),
+      type: this.attr('ADULT')
     }
   } 
 }
@@ -443,7 +468,8 @@ export default class Adult extends Person {
   static fields() {
     return {
       ...super.fields(),
-      job: this.attr('')
+      job: this.attr(''),
+      type: this.attr('ADULT')
     }
   }
 }
@@ -507,7 +533,8 @@ export class Adult extends Person {
   static fields() {
     return {
       ...super.fields(),
-      job: this.attr('')
+      job: this.attr(''),
+      type: this.attr('ADULT')
     }
   }
 }