revisar update y falta delete

src/carrera-programa/carrera-programa.controller.ts

@@ -1,19 +1,27 @@
-import { Controller, Delete, Get, Post, Put } from '@nestjs/common';
+import { Body, Controller, Delete, Get, Post, Put } from '@nestjs/common';
 import { CarreraProgramaService } from './carrera-programa.service';
+import { CarreraProgramaCreateDto } from './dto/carrera-programa-create.dto'
+import { CarreraProgramaUpdateDto } from './dto/carrera-programa-update.dto'
 
 @Controller('carrera-programa')
 export class CarreraProgramaController {
   constructor(private carreraProgramaService: CarreraProgramaService) {}
 
   @Post()
-  create() {}
+  create(@Body() body: CarreraProgramaCreateDto) {
+    return this.carreraProgramaService.create(body.id_carrera, body.id_programa)
+  }
 
   @Delete()
   delete() {}
 
   @Get()
-  get() {}
+  get() {
+    return this.carreraProgramaService.findAll()
+  }
 
   @Put()
-  update() {}
+  update(@Body() body: CarreraProgramaUpdateDto) {
+    return this.carreraProgramaService.update(body)
+  }
 }

src/carrera-programa/carrera-programa.service.ts

@@ -1,12 +1,62 @@
-import { Injectable } from '@nestjs/common';
+import {ConflictException,
+  Injectable,
+  NotFoundException, } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import { CarreraPrograma } from './entity/carrera-programa.entity';
+import { CarreraService } from '../carrera/carrera.service'
+import { ProgramaService } from '../programa/programa.service'
 
 @Injectable()
 export class CarreraProgramaService {
   constructor(
     @InjectRepository(CarreraPrograma)
     private repository: Repository<CarreraPrograma>,
-  ) {}
+    private carreraService: CarreraService,
+    private programaService: ProgramaService,
+  ) { }
+  
+  async create(id_carrera: number, id_programa: number) {
+    const carrera = await this.carreraService.findById(id_carrera)
+    const programa = await this.programaService.findById(id_programa)
+    const nuevoCarreraPrograma = this.repository.create({
+      carrera, programa,
+    });
+
+    return this.repository
+      .findOne({ carrera, programa })
+      .then((existeCarretaPrograma) => {
+        if (existeCarretaPrograma)
+          throw new ConflictException('Ya existe una carrera programa con este nombre, intente con uno diferente')
+        return this.repository.save(nuevoCarreraPrograma)
+      })
+    .then(() => ({message: 'se creo correctamente la carrera programa'}))
+  }
+
+  findAll() {
+    return this.repository.find()
+  }
+
+  findById(id_carrera_programa: number) {
+    return this.repository.findOne({ id_carrera_programa }).then((carreraPrograma) => {
+      if(!carreraPrograma) throw new NotFoundException('No existe esta carrera programa')
+    return carreraPrograma
+    })
+  }
+
+  async update(attrs: Partial<CarreraPrograma>) {
+    const carreraPrograma = await this.findById(attrs.id_carrera_programa)
+
+    return this.repository
+      .findOne({ id_carrera_programa: attrs.id_carrera_programa})
+      .then((existeCarreraPrograma) => {
+        if (existeCarreraPrograma)
+          throw new ConflictException('Ya existe esta carrera programa')
+        Object.assign(carreraPrograma, attrs)
+        return this.repository.save(carreraPrograma)
+      })
+      .then(() => ({
+      message: "Se actualizo correctamente la carrera programa"
+    }))
+  }
 }

src/carrera-programa/dto/carrera-programa-create.dto.ts

@@ -0,0 +1,9 @@
+import {IsNumber} from 'class-validator';
+
+export class CarreraProgramaCreateDto {
+    @IsNumber()
+    id_carrera: number;
+
+    @IsNumber()
+    id_programa: number;
+}

src/carrera-programa/dto/carrera-programa-update.dto.ts

@@ -0,0 +1,12 @@
+import {IsNumber} from 'class-validator';
+
+export class CarreraProgramaUpdateDto {
+    @IsNumber()
+    id_carrera_programa: number;
+
+    @IsNumber()
+    id_carrera: number;
+
+    @IsNumber()
+    id_programa: number;
+}