Code cleanup and add support for default values and nullable relationships (#7687)

packages/core/utils/src/dml/__tests__/base_relationship.spec.ts

@@ -21,6 +21,35 @@ describe("Base relationship", () => {
     expect(relationship.parse("user")).toEqual({
       name: "user",
       type: "hasOne",
+      nullable: false,
+      entity: entityRef,
+      options: {
+        foreignKey: "user_id",
+      },
+    })
+  })
+
+  test("mark relationship as nullable", () => {
+    class HasOne<T> extends BaseRelationship<T> {
+      protected relationshipType: "hasOne" | "hasMany" | "manyToMany" = "hasOne"
+    }
+
+    const user = {
+      username: new TextSchema(),
+    }
+
+    const entityRef = () => user
+    const relationship = new HasOne(entityRef, {
+      foreignKey: "user_id",
+    }).nullable()
+
+    expectTypeOf(relationship["$dataType"]).toEqualTypeOf<
+      (() => typeof user) | null
+    >()
+    expect(relationship.parse("user")).toEqual({
+      name: "user",
+      type: "hasOne",
+      nullable: true,
       entity: entityRef,
       options: {
         foreignKey: "user_id",

packages/core/utils/src/dml/__tests__/base_schema.spec.ts

@@ -6,7 +6,7 @@ describe("Base schema", () => {
   test("create a schema type from base schema", () => {
     class StringSchema extends BaseSchema<string> {
       protected dataType: SchemaMetadata["dataType"] = {
-        name: "string",
+        name: "text",
       }
     }
 
@@ -16,10 +16,9 @@ describe("Base schema", () => {
     expect(schema.parse("username")).toEqual({
       fieldName: "username",
       dataType: {
-        name: "string",
+        name: "text",
       },
       nullable: false,
-      optional: false,
       indexes: [],
       relationships: [],
     })
@@ -28,7 +27,7 @@ describe("Base schema", () => {
   test("apply nullable modifier", () => {
     class StringSchema extends BaseSchema<string> {
       protected dataType: SchemaMetadata["dataType"] = {
-        name: "string",
+        name: "text",
       }
     }
 
@@ -38,54 +37,31 @@ describe("Base schema", () => {
     expect(schema.parse("username")).toEqual({
       fieldName: "username",
       dataType: {
-        name: "string",
+        name: "text",
       },
       nullable: true,
-      optional: false,
       indexes: [],
       relationships: [],
     })
   })
 
-  test("apply optional modifier", () => {
+  test("define default value", () => {
     class StringSchema extends BaseSchema<string> {
       protected dataType: SchemaMetadata["dataType"] = {
-        name: "string",
+        name: "text",
       }
     }
 
-    const schema = new StringSchema().optional()
+    const schema = new StringSchema().default("foo")
 
-    expectTypeOf(schema["$dataType"]).toEqualTypeOf<string | undefined>()
+    expectTypeOf(schema["$dataType"]).toEqualTypeOf<string>()
     expect(schema.parse("username")).toEqual({
       fieldName: "username",
       dataType: {
-        name: "string",
+        name: "text",
       },
+      defaultValue: "foo",
       nullable: false,
-      optional: true,
-      indexes: [],
-      relationships: [],
-    })
-  })
-
-  test("apply optional + nullable modifier", () => {
-    class StringSchema extends BaseSchema<string> {
-      protected dataType: SchemaMetadata["dataType"] = {
-        name: "string",
-      }
-    }
-
-    const schema = new StringSchema().optional().nullable()
-
-    expectTypeOf(schema["$dataType"]).toEqualTypeOf<string | undefined | null>()
-    expect(schema.parse("username")).toEqual({
-      fieldName: "username",
-      dataType: {
-        name: "string",
-      },
-      nullable: true,
-      optional: true,
       indexes: [],
       relationships: [],
     })

packages/core/utils/src/dml/__tests__/boolean_schema.spec.ts

@@ -12,7 +12,6 @@ describe("Boolean schema", () => {
         name: "boolean",
       },
       nullable: false,
-      optional: false,
       indexes: [],
       relationships: [],
     })

packages/core/utils/src/dml/__tests__/date_time_schema.spec.ts

@@ -12,7 +12,6 @@ describe("DateTime schema", () => {
         name: "dateTime",
       },
       nullable: false,
-      optional: false,
       indexes: [],
       relationships: [],
     })

packages/core/utils/src/dml/__tests__/entity_builder.spec.ts

@@ -122,6 +122,56 @@ describe("Entity builder", () => {
     ])
   })
 
+  test("define an entity with default value", () => {
+    const model = new EntityBuilder()
+    const user = model.define("user", {
+      id: model.number(),
+      username: model.text().default("foo"),
+      email: model.text(),
+    })
+
+    const User = createMikrORMEntity(user)
+    expectTypeOf(new User()).toMatchTypeOf<{
+      id: number
+      username: string
+      email: string
+    }>()
+
+    const metaData = MetadataStorage.getMetadataFromDecorator(User)
+    expect(metaData.className).toEqual("User")
+    expect(metaData.path).toEqual("User")
+    expect(metaData.properties).toEqual({
+      id: {
+        reference: "scalar",
+        type: "number",
+        columnType: "integer",
+        name: "id",
+        nullable: false,
+        getter: false,
+        setter: false,
+      },
+      username: {
+        reference: "scalar",
+        type: "string",
+        default: "foo",
+        columnType: "text",
+        name: "username",
+        nullable: false,
+        getter: false,
+        setter: false,
+      },
+      email: {
+        reference: "scalar",
+        type: "string",
+        columnType: "text",
+        name: "email",
+        nullable: false,
+        getter: false,
+        setter: false,
+      },
+    })
+  })
+
   test("define hasMany relationship", () => {
     const model = new EntityBuilder()
     const email = model.define("email", {

packages/core/utils/src/dml/__tests__/enum_schema.spec.ts

@@ -17,19 +17,16 @@ describe("Enum schema", () => {
         },
       },
       nullable: false,
-      optional: false,
       indexes: [],
       relationships: [],
     })
   })
 
-  test("apply nullable and optional modifiers", () => {
-    const schema = new EnumSchema(["admin", "moderator", "editor"])
-      .nullable()
-      .optional()
+  test("apply nullable modifier", () => {
+    const schema = new EnumSchema(["admin", "moderator", "editor"]).nullable()
 
     expectTypeOf(schema["$dataType"]).toEqualTypeOf<
-      "admin" | "moderator" | "editor" | null | undefined
+      "admin" | "moderator" | "editor" | null
     >()
 
     expect(schema.parse("role")).toEqual({
@@ -41,7 +38,6 @@ describe("Enum schema", () => {
         },
       },
       nullable: true,
-      optional: true,
       indexes: [],
       relationships: [],
     })

packages/core/utils/src/dml/__tests__/has_many_relationship.spec.ts

@@ -15,6 +15,7 @@ describe("HasMany relationship", () => {
     expect(relationship.parse("user")).toEqual({
       name: "user",
       type: "hasMany",
+      nullable: false,
       entity: entityRef,
       options: {},
     })

packages/core/utils/src/dml/__tests__/has_one_relationship.spec.ts

@@ -15,6 +15,7 @@ describe("HasOne relationship", () => {
     expect(relationship.parse("user")).toEqual({
       name: "user",
       type: "hasOne",
+      nullable: false,
       entity: entityRef,
       options: {},
     })

packages/core/utils/src/dml/__tests__/json_schema.spec.ts

@@ -12,7 +12,6 @@ describe("JSON schema", () => {
         name: "json",
       },
       nullable: false,
-      optional: false,
       indexes: [],
       relationships: [],
     })

packages/core/utils/src/dml/__tests__/many_to_many.spec.ts

@@ -15,6 +15,7 @@ describe("ManyToMany relationship", () => {
     expect(relationship.parse("user")).toEqual({
       name: "user",
       type: "manyToMany",
+      nullable: false,
       entity: entityRef,
       options: {},
     })

packages/core/utils/src/dml/__tests__/number_schema.spec.ts

@@ -12,7 +12,6 @@ describe("Number schema", () => {
         name: "number",
       },
       nullable: false,
-      optional: false,
       indexes: [],
       relationships: [],
     })

packages/core/utils/src/dml/__tests__/text_schema.spec.ts

@@ -9,10 +9,9 @@ describe("String schema", () => {
     expect(schema.parse("username")).toEqual({
       fieldName: "username",
       dataType: {
-        name: "string",
+        name: "text",
       },
       nullable: false,
-      optional: false,
       indexes: [],
       relationships: [],
     })

packages/core/utils/src/dml/entity.ts

@@ -1,5 +1,9 @@
 import { RelationshipType, SchemaType } from "./types"
 
+/**
+ * Dml entity is a representation of a DML model with a unique
+ * name, its schema and relationships.
+ */
 export class DmlEntity<
   Schema extends Record<string, SchemaType<any> | RelationshipType<any>>
 > {

packages/core/utils/src/dml/entity_builder.ts

@@ -1,5 +1,6 @@
 import { DmlEntity } from "./entity"
 import { TextSchema } from "./schema/text"
+import { EnumSchema } from "./schema/enum"
 import { JSONSchema } from "./schema/json"
 import { HasOne } from "./relations/has_one"
 import { HasMany } from "./relations/has_many"
@@ -8,52 +9,114 @@ import { BooleanSchema } from "./schema/boolean"
 import { DateTimeSchema } from "./schema/date_time"
 import { ManyToMany } from "./relations/many_to_many"
 import { RelationshipType, SchemaType } from "./types"
-import { EnumSchema } from "./schema/enum"
 import { HasOneThroughMany } from "./relations/has_one_through_many"
 
+/**
+ * Entity builder exposes the API to create an entity and define its
+ * schema using the shorthand methods.
+ */
 export class EntityBuilder {
+  /**
+   * Define an entity or a model. The name should be unique across
+   * all the entities.
+   */
   define<
     Schema extends Record<string, SchemaType<any> | RelationshipType<any>>
   >(name: string, schema: Schema) {
     return new DmlEntity(name, schema)
   }
 
+  /**
+   * Define a text/string based column
+   */
   text() {
     return new TextSchema()
   }
 
+  /**
+   * Define a boolean column
+   */
   boolean() {
     return new BooleanSchema()
   }
 
+  /**
+   * Define a numeric/integer column
+   */
   number() {
     return new NumberSchema()
   }
 
+  /**
+   * Define a timestampz column
+   */
   dateTime() {
     return new DateTimeSchema()
   }
 
+  /**
+   * Define a JSON column to store data as a
+   * JSON string
+   */
   json() {
     return new JSONSchema()
   }
 
+  /**
+   * Define an enum column where only a pre-defined set
+   * of values are allowed.
+   */
   enum<const Values extends unknown>(values: Values[]) {
     return new EnumSchema<Values>(values)
   }
 
+  /**
+   * Has one relationship defines a relationship between two entities
+   * where the owner of the relationship has exactly one instance
+   * of the related entity.
+   *
+   * For example: A user "hasOne" profile
+   *
+   * You may use the "belongsTo" relationship to define the inverse
+   * of the "hasOne" relationship
+   */
   hasOne<T>(entityBuilder: T, options?: Record<string, any>) {
     return new HasOne<T>(entityBuilder, options || {})
   }
 
+  /**
+   * Has many relationship defines a relationship between two entities
+   * where the owner of the relationship has many instance of the
+   * related entity.
+   *
+   * For example:
+   *
+   * - A user "hasMany" books
+   * - A user "hasMany" addresses
+   */
   hasMany<T>(entityBuilder: T, options?: Record<string, any>) {
     return new HasMany<T>(entityBuilder, options || {})
   }
 
+  /**
+   * Define a hasOneThroughMany relationship between two entities.
+   * @todo Remove in favor of "belongTo"
+   */
   hasOneThroughMany<T>(entityBuilder: T, options?: Record<string, any>) {
     return new HasOneThroughMany<T>(entityBuilder, options || {})
   }
 
+  /**
+   * ManyToMany relationship defines a relationship between two entities
+   * where the owner of the relationship has many instance of the
+   * related entity via a pivot table.
+   *
+   * For example:
+   *
+   * - A user has many teams. But a team has many users as well. So this
+   *   relationship requires a pivot table to establish a many to many
+   *   relationship between two entities
+   */
   manyToMany<T>(entityBuilder: T, options?: Record<string, any>) {
     return new ManyToMany<T>(entityBuilder, options || {})
   }

packages/core/utils/src/dml/helpers/create_mikro_orm_entity.ts

@@ -23,32 +23,36 @@ import type {
 
 /**
  * DML entity data types to PostgreSQL data types via
- * Mikro ORM
+ * Mikro ORM.
+ *
+ * We remove "enum" type from here, because we use a dedicated
+ * mikro orm decorator for that
  */
 const COLUMN_TYPES: {
-  [K in KnownDataTypes]: string
+  [K in Exclude<KnownDataTypes, "enum">]: string
 } = {
   boolean: "boolean",
   dateTime: "timestamptz",
   number: "integer",
-  string: "text",
+  text: "text",
   json: "jsonb",
-  enum: "enum", // ignore for now
 }
 
 /**
  * DML entity data types to Mikro ORM property
- * types
+ * types.
+ *
+ * We remove "enum" type from here, because we use a dedicated
+ * mikro orm decorator for that
  */
 const PROPERTY_TYPES: {
-  [K in KnownDataTypes]: string
+  [K in Exclude<KnownDataTypes, "enum">]: string
 } = {
   boolean: "boolean",
   dateTime: "date",
   number: "number",
-  string: "string",
+  text: "string",
   json: "any",
-  enum: "enum", // ignore for now
 }
 
 /**
@@ -65,20 +69,23 @@ function defineProperty(
     Enum({
       items: () => field.dataType.options!.choices,
       nullable: field.nullable,
+      default: field.defaultValue,
     })(MikroORMEntity.prototype, field.fieldName)
     return
   }
 
+  /**
+   * Define rest of properties
+   */
   const columnType = COLUMN_TYPES[field.dataType.name]
   const propertyType = PROPERTY_TYPES[field.dataType.name]
 
-  /**
-   * @todo: Add support for default value
-   */
-  Property({ columnType, type: propertyType, nullable: field.nullable })(
-    MikroORMEntity.prototype,
-    field.fieldName
-  )
+  Property({
+    columnType,
+    type: propertyType,
+    nullable: field.nullable,
+    default: field.defaultValue,
+  })(MikroORMEntity.prototype, field.fieldName)
 }
 
 /**
@@ -89,7 +96,8 @@ function defineRelationship(
   relationship: RelationshipMetadata
 ) {
   /**
-   * Defining relationships
+   * We expect the relationship.entity to be a function that
+   * lazily returns the related entity
    */
   const relatedEntity =
     typeof relationship.entity === "function"
@@ -115,6 +123,10 @@ function defineRelationship(
     )
   }
 
+  /**
+   * Converting the related entity name (which should be in camelCase)
+   * to "PascalCase"
+   */
   const relatedModelName = upperCaseFirst(relatedEntity.name)
 
   /**

packages/core/utils/src/dml/modifiers/nullable.ts

@@ -1,6 +1,8 @@
-import { SchemaType } from "../types"
-import { OptionalModifier } from "./optional"
+import { MaybeFieldMetadata } from "../types"
 
+/**
+ * Nullable modifier marks a schema node as nullable
+ */
 export class NullableModifier<T> {
   /**
    * A type-only property to infer the JavScript data-type
@@ -12,17 +14,12 @@ export class NullableModifier<T> {
    * The parent schema on which the nullable modifier is
    * applied
    */
-  #schema: SchemaType<T>
-
-  constructor(schema: SchemaType<T>) {
-    this.#schema = schema
+  #schema: {
+    parse(fieldName: string): MaybeFieldMetadata
   }
 
-  /**
-   * Apply optional modifier on the schema
-   */
-  optional() {
-    return new OptionalModifier<T | null>(this)
+  constructor(schema: { parse(fieldName: string): MaybeFieldMetadata }) {
+    this.#schema = schema
   }
 
   /**

packages/core/utils/src/dml/modifiers/optional.ts

@@ -1,36 +0,0 @@
-import { SchemaType } from "../types"
-import { NullableModifier } from "./nullable"
-
-export class OptionalModifier<T> {
-  /**
-   * A type-only property to infer the JavScript data-type
-   * of the schema property
-   */
-  declare $dataType: T | undefined
-
-  /**
-   * The parent schema on which the nullable modifier is
-   * applied
-   */
-  #schema: SchemaType<T>
-
-  constructor(schema: SchemaType<T>) {
-    this.#schema = schema
-  }
-
-  /**
-   * Apply nullable modifier on the schema
-   */
-  nullable() {
-    return new NullableModifier<T | undefined>(this)
-  }
-
-  /**
-   * Returns the serialized metadata
-   */
-  parse(fieldName: string) {
-    const schema = this.#schema.parse(fieldName)
-    schema.optional = true
-    return schema
-  }
-}

packages/core/utils/src/dml/relations/base.ts

@@ -1,3 +1,4 @@
+import { NullableModifier } from "../modifiers/nullable"
 import { RelationshipMetadata, RelationshipType } from "../types"
 
 /**
@@ -24,12 +25,20 @@ export abstract class BaseRelationship<T> implements RelationshipType<T> {
     this.#options = options
   }
 
+  /**
+   * Apply nullable modifier on the schema
+   */
+  nullable() {
+    return new NullableModifier<T>(this)
+  }
+
   /**
    * Returns the parsed copy of the relationship
    */
   parse(relationshipName: string): RelationshipMetadata {
     return {
       name: relationshipName,
+      nullable: false,
       entity: this.#referencedEntity,
       options: this.#options,
       type: this.relationshipType,

packages/core/utils/src/dml/relations/has_many.ts

@@ -1,6 +1,16 @@
 import { BaseRelationship } from "./base"
 import { RelationshipMetadata } from "../types"
 
+/**
+ * HasMany relationship defines a relationship between two entities
+ * where the owner of the relationship has many instance of the
+ * related entity.
+ *
+ * For example:
+ *
+ * - A user HasMany books
+ * - A user HasMany addresses
+ */
 export class HasMany<T> extends BaseRelationship<T> {
   protected relationshipType: RelationshipMetadata["type"] = "hasMany"
 }

packages/core/utils/src/dml/relations/has_one.ts

@@ -1,6 +1,16 @@
 import { BaseRelationship } from "./base"
 import { RelationshipMetadata } from "../types"
 
+/**
+ * HasOne relationship defines a relationship between two entities
+ * where the owner of the relationship has exactly one instance
+ * of the related entity.
+ *
+ * For example: A user HasOne profile
+ *
+ * You may use the "BelongsTo" relationship to define the inverse
+ * of the "HasOne" relationship
+ */
 export class HasOne<T> extends BaseRelationship<T> {
   protected relationshipType: RelationshipMetadata["type"] = "hasOne"
 }

packages/core/utils/src/dml/relations/many_to_many.ts

@@ -1,6 +1,17 @@
 import { BaseRelationship } from "./base"
 import { RelationshipMetadata } from "../types"
 
+/**
+ * ManyToMany relationship defines a relationship between two entities
+ * where the owner of the relationship has many instance of the
+ * related entity via a pivot table.
+ *
+ * For example:
+ *
+ * - A user has many teams. But a team has many users as well. So this
+ *   relationship requires a pivot table to establish a many to many
+ *   relationship between two entities
+ */
 export class ManyToMany<T> extends BaseRelationship<T> {
   protected relationshipType: RelationshipMetadata["type"] = "manyToMany"
 }

packages/core/utils/src/dml/schema/base.ts

@@ -1,6 +1,5 @@
 import { SchemaMetadata, SchemaType } from "../types"
 import { NullableModifier } from "../modifiers/nullable"
-import { OptionalModifier } from "../modifiers/optional"
 
 /**
  * The base schema class offers shared affordances to define
@@ -9,6 +8,7 @@ import { OptionalModifier } from "../modifiers/optional"
 export abstract class BaseSchema<T> implements SchemaType<T> {
   #indexes: SchemaMetadata["indexes"] = []
   #relationships: SchemaMetadata["relationships"] = []
+  #defaultValue?: T
 
   /**
    * The runtime dataType for the schema. It is not the same as
@@ -30,10 +30,11 @@ export abstract class BaseSchema<T> implements SchemaType<T> {
   }
 
   /**
-   * Apply optional modifier on the schema
+   * Define default value for the property
    */
-  optional() {
-    return new OptionalModifier<T>(this)
+  default(value: T) {
+    this.#defaultValue = value
+    return this
   }
 
   /**
@@ -44,7 +45,7 @@ export abstract class BaseSchema<T> implements SchemaType<T> {
       fieldName,
       dataType: this.dataType,
       nullable: false,
-      optional: false,
+      defaultValue: this.#defaultValue,
       indexes: this.#indexes,
       relationships: this.#relationships,
     }

packages/core/utils/src/dml/schema/boolean.ts

@@ -1,6 +1,10 @@
 import { SchemaMetadata } from "../types"
 import { BaseSchema } from "./base"
 
+/**
+ * The BooleanSchema class is used to define a boolean
+ * property
+ */
 export class BooleanSchema extends BaseSchema<boolean> {
   protected dataType: SchemaMetadata["dataType"] = {
     name: "boolean",

packages/core/utils/src/dml/schema/date_time.ts

@@ -1,6 +1,10 @@
 import { SchemaMetadata } from "../types"
 import { BaseSchema } from "./base"
 
+/**
+ * The DateTimeSchema class is used to define a timestampz
+ * property
+ */
 export class DateTimeSchema extends BaseSchema<Date> {
   protected dataType: SchemaMetadata["dataType"] = {
     name: "dateTime",

packages/core/utils/src/dml/schema/enum.ts

@@ -1,6 +1,10 @@
 import { SchemaMetadata } from "../types"
 import { BaseSchema } from "./base"
 
+/**
+ * The EnumSchema is used to define a property with pre-defined
+ * list of choices.
+ */
 export class EnumSchema<
   const Values extends unknown
 > extends BaseSchema<Values> {

packages/core/utils/src/dml/schema/json.ts

@@ -1,6 +1,10 @@
 import { SchemaMetadata } from "../types"
 import { BaseSchema } from "./base"
 
+/**
+ * The JSONSchema is used to define a property that stores
+ * data as a JSON string
+ */
 export class JSONSchema extends BaseSchema<string> {
   protected dataType: SchemaMetadata["dataType"] = {
     name: "json",

packages/core/utils/src/dml/schema/number.ts

@@ -1,6 +1,10 @@
 import { SchemaMetadata } from "../types"
 import { BaseSchema } from "./base"
 
+/**
+ * The NumberSchema is used to define a numeric/integer
+ * property
+ */
 export class NumberSchema extends BaseSchema<number> {
   protected dataType: SchemaMetadata["dataType"] = {
     name: "number",

packages/core/utils/src/dml/schema/text.ts

@@ -1,8 +1,11 @@
 import { SchemaMetadata } from "../types"
 import { BaseSchema } from "./base"
 
+/**
+ * The NumberSchema is used to define a textual property
+ */
 export class TextSchema extends BaseSchema<string> {
   protected dataType: SchemaMetadata["dataType"] = {
-    name: "string",
+    name: "text",
   }
 }

packages/core/utils/src/dml/symbols.ts

@@ -1,3 +0,0 @@
-export const MIKRO_ORM_ENTITY_GENERATOR = Symbol.for(
-  "generate_mikro_orm_entity"
-)

packages/core/utils/src/dml/types.ts

@@ -4,7 +4,7 @@ import { DmlEntity } from "./entity"
  * The supported data types
  */
 export type KnownDataTypes =
-  | "string"
+  | "text"
   | "boolean"
   | "enum"
   | "number"
@@ -12,23 +12,22 @@ export type KnownDataTypes =
   | "json"
 
 /**
- * The meta-data returned by the relationship parse
- * method
+ * Any field that contains "nullable" and "optional" properties
+ * in their metadata are qualified as maybe fields.
+ *
+ * This allows us to wrap them inside "NullableModifier" and
+ * "OptionalModifier" classes.
  */
-export type RelationshipMetadata = {
-  name: string
-  type: "hasOne" | "hasMany" | "hasOneThroughMany" | "manyToMany"
-  entity: unknown
-  options: Record<string, any>
+export type MaybeFieldMetadata = {
+  nullable: boolean
 }
 
 /**
  * The meta-data returned by the schema parse method
  */
-export type SchemaMetadata = {
-  nullable: boolean
-  optional: boolean
+export type SchemaMetadata = MaybeFieldMetadata & {
   fieldName: string
+  defaultValue?: any
   dataType: {
     name: KnownDataTypes
     options?: Record<string, any>
@@ -50,6 +49,17 @@ export type SchemaType<T> = {
   parse(fieldName: string): SchemaMetadata
 }
 
+/**
+ * The meta-data returned by the relationship parse
+ * method
+ */
+export type RelationshipMetadata = MaybeFieldMetadata & {
+  name: string
+  type: "hasOne" | "hasMany" | "hasOneThroughMany" | "manyToMany"
+  entity: unknown
+  options: Record<string, any>
+}
+
 /**
  * Definition of a relationship type. It should have a parse
  * method to get the metadata and a type-only property