NestJS : Inject Service into Models / Entities
i am currently stuck on a problem, which i don't know how to propery solve:
In my NestJS application, I would like to make all my TypeORM Entities extend a BaseEntity class that provide some general features. For example, i would like to provide an additional getHashedID() method that hashed (and therefore hides) the internal ID from my API customers.
Hashing is done by a HashIdService, which provides an encode() and decode() method.
My setup looks like this (removed the Decorators for readability!):
export class User extends BaseEntity {
id: int;
email: string;
name: string;
// ...
}
export class BaseEntity {
@Inject(HashIdService) private readonly hashids: HashIdService;
getHashedId() {
return this.hashids.encode(this.id);
}
}
However, if i call the this.hashids.encode() method, it throws an exception with:
Cannot read property 'encode' of undefined
How can i inject a service into a entity/model class? Is this even possible?
UPDATE #1
In particular, i would like to "inject" the HashIdService into my Entities. Further, the Entities should have a getHashedId() method that returns their hashed ID.. As i don't want to do this "over and over again", i would like to "hide" this method in the BaseEntity as described above..
My current NestJS version is as follows:
Nest version:
+-- @nestjs/common@5.4.0
+-- @nestjs/core@5.4.0
+-- @nestjs/microservices@5.4.0
+-- @nestjs/testing@5.4.0
+-- @nestjs/websockets@5.4.0
Thank you very much for your help!
dependency-injection entity nestjs
asked Nov 23 '18 at 9:10
zornzorn
11
add a comment |
i am currently stuck on a problem, which i don't know how to propery solve:
In my NestJS application, I would like to make all my TypeORM Entities extend a BaseEntity class that provide some general features. For example, i would like to provide an additional getHashedID() method that hashed (and therefore hides) the internal ID from my API customers.
Hashing is done by a HashIdService, which provides an encode() and decode() method.
My setup looks like this (removed the Decorators for readability!):
export class User extends BaseEntity {
id: int;
email: string;
name: string;
// ...
}
export class BaseEntity {
@Inject(HashIdService) private readonly hashids: HashIdService;
getHashedId() {
return this.hashids.encode(this.id);
}
}
However, if i call the this.hashids.encode() method, it throws an exception with:
Cannot read property 'encode' of undefined
How can i inject a service into a entity/model class? Is this even possible?
UPDATE #1
In particular, i would like to "inject" the HashIdService into my Entities. Further, the Entities should have a getHashedId() method that returns their hashed ID.. As i don't want to do this "over and over again", i would like to "hide" this method in the BaseEntity as described above..
My current NestJS version is as follows:
Nest version:
+-- @nestjs/common@5.4.0
+-- @nestjs/core@5.4.0
+-- @nestjs/microservices@5.4.0
+-- @nestjs/testing@5.4.0
+-- @nestjs/websockets@5.4.0
Thank you very much for your help!
dependency-injection entity nestjs
asked Nov 23 '18 at 9:10
zornzorn
11
Why is it necessary that this particular service gets injected as opposed to just referencing a utility function?
– Jesse Carter
Nov 23 '18 at 14:25
@JesseCarter Maybe it needs something like access to DB which is otherwise injected?
– Lazar Ljubenović
Nov 24 '18 at 17:02
@JesseCarter I just updated my initial question. I would like to inject theHashIdServiceso my entites are able to hash their own ID.. How would you solve this issue? What do you mean with a "utility function"?
– zorn
Nov 25 '18 at 11:07
add a comment |
i am currently stuck on a problem, which i don't know how to propery solve:
In my NestJS application, I would like to make all my TypeORM Entities extend a BaseEntity class that provide some general features. For example, i would like to provide an additional getHashedID() method that hashed (and therefore hides) the internal ID from my API customers.
Hashing is done by a HashIdService, which provides an encode() and decode() method.
My setup looks like this (removed the Decorators for readability!):
export class User extends BaseEntity {
id: int;
email: string;
name: string;
// ...
}
export class BaseEntity {
@Inject(HashIdService) private readonly hashids: HashIdService;
getHashedId() {
return this.hashids.encode(this.id);
}
}
However, if i call the this.hashids.encode() method, it throws an exception with:
Cannot read property 'encode' of undefined
How can i inject a service into a entity/model class? Is this even possible?
UPDATE #1
In particular, i would like to "inject" the HashIdService into my Entities. Further, the Entities should have a getHashedId() method that returns their hashed ID.. As i don't want to do this "over and over again", i would like to "hide" this method in the BaseEntity as described above..
My current NestJS version is as follows:
Nest version:
+-- @nestjs/common@5.4.0
+-- @nestjs/core@5.4.0
+-- @nestjs/microservices@5.4.0
+-- @nestjs/testing@5.4.0
+-- @nestjs/websockets@5.4.0
Thank you very much for your help!
dependency-injection entity nestjs
asked Nov 23 '18 at 9:10
zornzorn
11
i am currently stuck on a problem, which i don't know how to propery solve:
In my NestJS application, I would like to make all my TypeORM Entities extend a BaseEntity class that provide some general features. For example, i would like to provide an additional getHashedID() method that hashed (and therefore hides) the internal ID from my API customers.
Hashing is done by a HashIdService, which provides an encode() and decode() method.
My setup looks like this (removed the Decorators for readability!):
export class User extends BaseEntity {
id: int;
email: string;
name: string;
// ...
}
export class BaseEntity {
@Inject(HashIdService) private readonly hashids: HashIdService;
getHashedId() {
return this.hashids.encode(this.id);
}
}
However, if i call the this.hashids.encode() method, it throws an exception with:
Cannot read property 'encode' of undefined
How can i inject a service into a entity/model class? Is this even possible?
UPDATE #1
In particular, i would like to "inject" the HashIdService into my Entities. Further, the Entities should have a getHashedId() method that returns their hashed ID.. As i don't want to do this "over and over again", i would like to "hide" this method in the BaseEntity as described above..
My current NestJS version is as follows:
Nest version:
+-- @nestjs/common@5.4.0
+-- @nestjs/core@5.4.0
+-- @nestjs/microservices@5.4.0
+-- @nestjs/testing@5.4.0
+-- @nestjs/websockets@5.4.0
Thank you very much for your help!
dependency-injection entity nestjs
dependency-injection entity nestjs
asked Nov 23 '18 at 9:10
zornzorn
11
asked Nov 23 '18 at 9:10
zornzorn
11
edited Nov 25 '18 at 11:06
zorn
asked Nov 23 '18 at 9:10
zornzorn
11
asked Nov 23 '18 at 9:10
zornzorn
11
asked Nov 23 '18 at 9:10
zornzorn
11
11
Why is it necessary that this particular service gets injected as opposed to just referencing a utility function?
– Jesse Carter
Nov 23 '18 at 14:25
@JesseCarter Maybe it needs something like access to DB which is otherwise injected?
– Lazar Ljubenović
Nov 24 '18 at 17:02
@JesseCarter I just updated my initial question. I would like to inject theHashIdServiceso my entites are able to hash their own ID.. How would you solve this issue? What do you mean with a "utility function"?
– zorn
Nov 25 '18 at 11:07
add a comment |
Why is it necessary that this particular service gets injected as opposed to just referencing a utility function?
– Jesse Carter
Nov 23 '18 at 14:25
@JesseCarter Maybe it needs something like access to DB which is otherwise injected?
– Lazar Ljubenović
Nov 24 '18 at 17:02
@JesseCarter I just updated my initial question. I would like to inject theHashIdServiceso my entites are able to hash their own ID.. How would you solve this issue? What do you mean with a "utility function"?
– zorn
Nov 25 '18 at 11:07
Why is it necessary that this particular service gets injected as opposed to just referencing a utility function?
– Jesse Carter
Nov 23 '18 at 14:25
Why is it necessary that this particular service gets injected as opposed to just referencing a utility function?
– Jesse Carter
Nov 23 '18 at 14:25
@JesseCarter Maybe it needs something like access to DB which is otherwise injected?
– Lazar Ljubenović
Nov 24 '18 at 17:02
@JesseCarter Maybe it needs something like access to DB which is otherwise injected?
– Lazar Ljubenović
Nov 24 '18 at 17:02
@JesseCarter I just updated my initial question. I would like to inject the
HashIdService so my entites are able to hash their own ID.. How would you solve this issue? What do you mean with a "utility function"?– zorn
Nov 25 '18 at 11:07
@JesseCarter I just updated my initial question. I would like to inject the
HashIdService so my entites are able to hash their own ID.. How would you solve this issue? What do you mean with a "utility function"?– zorn
Nov 25 '18 at 11:07
add a comment |
1 Answer
1
active
oldest
votes
Dependency Injection can be a very useful technique especially when it comes to testing but for something simple like hasing an Id you could easily just export a function from somewhere and then simply import it in your BaseEntity. If it's only ever used by your BaseEntity you could even just have it in the same file. Trying to inject this behavior with a service seems like overkill.
// BaseEntity.ts
function encodeHash() {
// logic for hashing
}
class BaseEntity {
public getHashedId() {
return encodeHash(this.id).
}
}
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
1
Dear @JesseCarter , thank you very much for your response. However, how do you handle it, if theencodeHashfunction depends on a 3rd-party service? E.g., hashing itself is provided byHashIdspackage, and theHashIdspackage is configured via config-params from aConfigService..
– zorn
Nov 26 '18 at 16:29
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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oldest
votes
Dependency Injection can be a very useful technique especially when it comes to testing but for something simple like hasing an Id you could easily just export a function from somewhere and then simply import it in your BaseEntity. If it's only ever used by your BaseEntity you could even just have it in the same file. Trying to inject this behavior with a service seems like overkill.
// BaseEntity.ts
function encodeHash() {
// logic for hashing
}
class BaseEntity {
public getHashedId() {
return encodeHash(this.id).
}
}
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
1
Dear @JesseCarter , thank you very much for your response. However, how do you handle it, if theencodeHashfunction depends on a 3rd-party service? E.g., hashing itself is provided byHashIdspackage, and theHashIdspackage is configured via config-params from aConfigService..
– zorn
Nov 26 '18 at 16:29
add a comment |
Dependency Injection can be a very useful technique especially when it comes to testing but for something simple like hasing an Id you could easily just export a function from somewhere and then simply import it in your BaseEntity. If it's only ever used by your BaseEntity you could even just have it in the same file. Trying to inject this behavior with a service seems like overkill.
// BaseEntity.ts
function encodeHash() {
// logic for hashing
}
class BaseEntity {
public getHashedId() {
return encodeHash(this.id).
}
}
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
1
Dear @JesseCarter , thank you very much for your response. However, how do you handle it, if theencodeHashfunction depends on a 3rd-party service? E.g., hashing itself is provided byHashIdspackage, and theHashIdspackage is configured via config-params from aConfigService..
– zorn
Nov 26 '18 at 16:29
add a comment |
Dependency Injection can be a very useful technique especially when it comes to testing but for something simple like hasing an Id you could easily just export a function from somewhere and then simply import it in your BaseEntity. If it's only ever used by your BaseEntity you could even just have it in the same file. Trying to inject this behavior with a service seems like overkill.
// BaseEntity.ts
function encodeHash() {
// logic for hashing
}
class BaseEntity {
public getHashedId() {
return encodeHash(this.id).
}
}
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
Dependency Injection can be a very useful technique especially when it comes to testing but for something simple like hasing an Id you could easily just export a function from somewhere and then simply import it in your BaseEntity. If it's only ever used by your BaseEntity you could even just have it in the same file. Trying to inject this behavior with a service seems like overkill.
// BaseEntity.ts
function encodeHash() {
// logic for hashing
}
class BaseEntity {
public getHashedId() {
return encodeHash(this.id).
}
}
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
answered Nov 25 '18 at 14:43
Jesse CarterJesse Carter
9,25133560
9,25133560
1
Dear @JesseCarter , thank you very much for your response. However, how do you handle it, if theencodeHashfunction depends on a 3rd-party service? E.g., hashing itself is provided byHashIdspackage, and theHashIdspackage is configured via config-params from aConfigService..
– zorn
Nov 26 '18 at 16:29
add a comment |
1
Dear @JesseCarter , thank you very much for your response. However, how do you handle it, if theencodeHashfunction depends on a 3rd-party service? E.g., hashing itself is provided byHashIdspackage, and theHashIdspackage is configured via config-params from aConfigService..
– zorn
Nov 26 '18 at 16:29
1
1
Dear @JesseCarter , thank you very much for your response. However, how do you handle it, if the
encodeHash function depends on a 3rd-party service? E.g., hashing itself is provided by HashIds package, and the HashIds package is configured via config-params from a ConfigService..– zorn
Nov 26 '18 at 16:29
Dear @JesseCarter , thank you very much for your response. However, how do you handle it, if the
encodeHash function depends on a 3rd-party service? E.g., hashing itself is provided by HashIds package, and the HashIds package is configured via config-params from a ConfigService..– zorn
Nov 26 '18 at 16:29
add a comment |
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Why is it necessary that this particular service gets injected as opposed to just referencing a utility function?
– Jesse Carter
Nov 23 '18 at 14:25
@JesseCarter Maybe it needs something like access to DB which is otherwise injected?
– Lazar Ljubenović
Nov 24 '18 at 17:02
@JesseCarter I just updated my initial question. I would like to inject the
HashIdServiceso my entites are able to hash their own ID.. How would you solve this issue? What do you mean with a "utility function"?– zorn
Nov 25 '18 at 11:07