diff --git a/api/src/nlp/repositories/nlp-sample.repository.spec.ts b/api/src/nlp/repositories/nlp-sample.repository.spec.ts
index 3d8da6a6..afcbebc7 100644
--- a/api/src/nlp/repositories/nlp-sample.repository.spec.ts
+++ b/api/src/nlp/repositories/nlp-sample.repository.spec.ts
@@ -219,12 +219,10 @@ describe('NlpSampleRepository', () => {
         skip: 0,
         sort: ['text', 'asc'],
       } as PageQueryDto<NlpSample>;
-      const projection = { text: 1 };
-
       const result = await nlpSampleRepository.findByEntitiesAndPopulate(
         { filters, values },
         page,
-        projection,
+        { text: 1 },
       );
 
       expect(Array.isArray(result)).toBe(true);
diff --git a/api/src/nlp/repositories/nlp-sample.repository.ts b/api/src/nlp/repositories/nlp-sample.repository.ts
index c9305dce..d41294a8 100644
--- a/api/src/nlp/repositories/nlp-sample.repository.ts
+++ b/api/src/nlp/repositories/nlp-sample.repository.ts
@@ -14,14 +14,13 @@ import {
   Document,
   Model,
   PipelineStage,
-  ProjectionType,
   Query,
   Types,
 } from 'mongoose';
 
 import { BaseRepository, DeleteResult } from '@/utils/generics/base-repository';
 import { PageQueryDto } from '@/utils/pagination/pagination-query.dto';
-import { TFilterQuery } from '@/utils/types/filter.types';
+import { TFilterQuery, TProjectionType } from '@/utils/types/filter.types';
 
 import { TNlpSampleDto } from '../dto/nlp-sample.dto';
 import { NlpSampleEntity } from '../schemas/nlp-sample-entity.schema';
@@ -183,7 +182,7 @@ export class NlpSampleRepository extends BaseRepository<
       values: NlpValue[];
     },
     page?: PageQueryDto<NlpSample>,
-    projection?: ProjectionType<NlpSample>,
+    projection?: TProjectionType<NlpSample>,
   ): Aggregate<NlpSampleDocument[]> {
     return this.model.aggregate<NlpSampleDocument>([
       ...this.buildFindByEntitiesStages(criterias),
@@ -211,7 +210,7 @@ export class NlpSampleRepository extends BaseRepository<
       values: NlpValue[];
     },
     page?: PageQueryDto<NlpSample>,
-    projection?: ProjectionType<NlpSample>,
+    projection?: TProjectionType<NlpSample>,
   ): Promise<NlpSample[]> {
     const aggregation = this.findByEntitiesAggregation(
       criterias,
@@ -239,7 +238,7 @@ export class NlpSampleRepository extends BaseRepository<
       values: NlpValue[];
     },
     page?: PageQueryDto<NlpSample>,
-    projection?: ProjectionType<NlpSample>,
+    projection?: TProjectionType<NlpSample>,
   ): Promise<NlpSampleFull[]> {
     const aggregation = this.findByEntitiesAggregation(
       criterias,
diff --git a/api/src/nlp/services/nlp-sample.service.ts b/api/src/nlp/services/nlp-sample.service.ts
index 5f789643..17627dd2 100644
--- a/api/src/nlp/services/nlp-sample.service.ts
+++ b/api/src/nlp/services/nlp-sample.service.ts
@@ -12,7 +12,7 @@ import {
   NotFoundException,
 } from '@nestjs/common';
 import { OnEvent } from '@nestjs/event-emitter';
-import { Document, ProjectionType, Query } from 'mongoose';
+import { Document, Query } from 'mongoose';
 import Papa from 'papaparse';
 
 import { Message } from '@/chat/schemas/message.schema';
@@ -22,7 +22,11 @@ import { LanguageService } from '@/i18n/services/language.service';
 import { DeleteResult } from '@/utils/generics/base-repository';
 import { BaseService } from '@/utils/generics/base-service';
 import { PageQueryDto } from '@/utils/pagination/pagination-query.dto';
-import { TFilterQuery, THydratedDocument } from '@/utils/types/filter.types';
+import {
+  TFilterQuery,
+  THydratedDocument,
+  TProjectionType,
+} from '@/utils/types/filter.types';
 
 import { NlpSampleEntityCreateDto } from '../dto/nlp-sample-entity.dto';
 import { NlpSampleCreateDto, TNlpSampleDto } from '../dto/nlp-sample.dto';
@@ -78,7 +82,7 @@ export class NlpSampleService extends BaseService<
       patterns: NlpValueMatchPattern[];
     },
     page?: PageQueryDto<NlpSample>,
-    projection?: ProjectionType<NlpSample>,
+    projection?: TProjectionType<NlpSample>,
   ): Promise<NlpSample[]> {
     if (!patterns.length) {
       return await this.repository.find(filters, page, projection);
@@ -118,7 +122,7 @@ export class NlpSampleService extends BaseService<
       patterns: NlpValueMatchPattern[];
     },
     page?: PageQueryDto<NlpSample>,
-    projection?: ProjectionType<NlpSample>,
+    projection?: TProjectionType<NlpSample>,
   ): Promise<NlpSampleFull[]> {
     if (!patterns.length) {
       return await this.repository.findAndPopulate(filters, page, projection);
diff --git a/api/src/utils/generics/base-repository.ts b/api/src/utils/generics/base-repository.ts
index 79a3d448..dda5be49 100644
--- a/api/src/utils/generics/base-repository.ts
+++ b/api/src/utils/generics/base-repository.ts
@@ -20,7 +20,6 @@ import {
   HydratedDocument,
   Model,
   PipelineStage,
-  ProjectionType,
   Query,
   SortOrder,
   UpdateQuery,
@@ -33,6 +32,7 @@ import {
   TFilterQuery,
   TFlattenOption,
   THydratedDocument,
+  TProjectionType,
   TQueryOptions,
 } from '@/utils/types/filter.types';
 
@@ -351,7 +351,7 @@ export abstract class BaseRepository<
    */
   protected findOneQuery(
     criteria: string | TFilterQuery<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Query<T | null, T, object, T, 'findOne', object> {
     if (!criteria) {
       // An empty criteria would return the first document that it finds
@@ -378,7 +378,7 @@ export abstract class BaseRepository<
   async findOne(
     criteria: string | TFilterQuery<T>,
     options?: ClassTransformOptions,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T | null> {
     if (!criteria) {
       // @TODO : Issue a warning ?
@@ -401,7 +401,7 @@ export abstract class BaseRepository<
    */
   async findOneAndPopulate(
     criteria: string | TFilterQuery<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<TFull | null> {
     this.ensureCanPopulate();
     const query = this.findOneQuery(criteria, projection).populate(
@@ -413,7 +413,7 @@ export abstract class BaseRepository<
   protected findQuery(
     filter: TFilterQuery<T>,
     pageQuery?: PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Query<T[], T, object, T, 'find', object>;
 
   /**
@@ -422,7 +422,7 @@ export abstract class BaseRepository<
   protected findQuery(
     filter: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Query<T[], T, object, T, 'find', object>;
 
   /**
@@ -439,7 +439,7 @@ export abstract class BaseRepository<
   protected findQuery(
     filter: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T> | PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Query<T[], T, object, T, 'find', object> {
     if (Array.isArray(pageQuery)) {
       const query = this.model.find<T>(filter, projection);
@@ -461,7 +461,7 @@ export abstract class BaseRepository<
   async find(
     filter: TFilterQuery<T>,
     pageQuery?: PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T[]>;
 
   /**
@@ -470,7 +470,7 @@ export abstract class BaseRepository<
   async find(
     filter: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T[]>;
 
   /**
@@ -490,7 +490,7 @@ export abstract class BaseRepository<
   async find(
     filter: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T> | PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T[]> {
     if (Array.isArray(pageQuery)) {
       const query = this.findQuery(filter, pageQuery, projection);
@@ -518,7 +518,7 @@ export abstract class BaseRepository<
   async findAndPopulate(
     filters: TFilterQuery<T>,
     pageQuery?: PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<TFull[]>;
 
   /**
@@ -527,7 +527,7 @@ export abstract class BaseRepository<
   async findAndPopulate(
     filters: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<TFull[]>;
 
   /**
@@ -547,7 +547,7 @@ export abstract class BaseRepository<
   async findAndPopulate(
     filters: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T> | PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<TFull[]> {
     this.ensureCanPopulate();
     if (Array.isArray(pageQuery)) {
diff --git a/api/src/utils/generics/base-service.ts b/api/src/utils/generics/base-service.ts
index 6f0b88af..c29ae101 100644
--- a/api/src/utils/generics/base-service.ts
+++ b/api/src/utils/generics/base-service.ts
@@ -9,12 +9,12 @@
 import { ConflictException, Inject } from '@nestjs/common';
 import { ClassTransformOptions } from 'class-transformer';
 import { MongoError } from 'mongodb';
-import { ProjectionType } from 'mongoose';
 
 import { LoggerService } from '@/logger/logger.service';
 import {
   TFilterQuery,
   TFlattenOption,
+  TProjectionType,
   TQueryOptions,
 } from '@/utils/types/filter.types';
 
@@ -51,14 +51,14 @@ export abstract class BaseService<
   async findOne(
     criteria: string | TFilterQuery<T>,
     options?: ClassTransformOptions,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T | null> {
     return await this.repository.findOne(criteria, options, projection);
   }
 
   async findOneAndPopulate(
     criteria: string | TFilterQuery<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ) {
     return await this.repository.findOneAndPopulate(criteria, projection);
   }
@@ -66,7 +66,7 @@ export abstract class BaseService<
   async find(
     filter: TFilterQuery<T>,
     pageQuery?: PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T[]>;
 
   /**
@@ -75,13 +75,13 @@ export abstract class BaseService<
   async find(
     filter: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T[]>;
 
   async find(
     filter: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T> | PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<T[]> {
     if (Array.isArray(pageQuery))
       return await this.repository.find(filter, pageQuery, projection);
@@ -92,7 +92,7 @@ export abstract class BaseService<
   async findAndPopulate(
     filters: TFilterQuery<T>,
     pageQuery?: PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<TFull[]>;
 
   /**
@@ -101,13 +101,13 @@ export abstract class BaseService<
   async findAndPopulate(
     filters: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<TFull[]>;
 
   async findAndPopulate(
     filters: TFilterQuery<T>,
     pageQuery?: QuerySortDto<T> | PageQueryDto<T>,
-    projection?: ProjectionType<T>,
+    projection?: TProjectionType<T>,
   ): Promise<TFull[]> {
     if (Array.isArray(pageQuery))
       return await this.repository.findAndPopulate(
diff --git a/api/src/utils/types/filter.types.ts b/api/src/utils/types/filter.types.ts
index 2c5f2d47..8ac03ad4 100644
--- a/api/src/utils/types/filter.types.ts
+++ b/api/src/utils/types/filter.types.ts
@@ -146,3 +146,9 @@ export type THydratedDocument<T> = TOmitId<HydratedDocument<T>>;
 export type TFlattenOption = { shouldFlatten?: boolean };
 
 export type TQueryOptions<D> = (QueryOptions<D> & TFlattenOption) | null;
+
+export type TProjectField = 0 | 1;
+
+export type TProjectionType<T> = {
+  [K in keyof T]?: TProjectField;
+};