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{ Injectable, HttpException } from \"@nestjs/common\";\nimport { InjectRepository } from \"@nestjs/typeorm\";\nimport { Repository } from \"typeorm\";\nimport { InfoGroup } from \"../model/info.group.entity\";\nimport { InfoItem } from \"../model/info.item.entity\";\n\n@Injectable()\nexport class InfoGroupService {\n\n constructor(\n @InjectRepository(InfoItem) private readonly infoItemRepository: Repository<InfoItem>,\n @InjectRepository(InfoGroup) private readonly infoGroupRepository: Repository<InfoGroup>\n ) {}\n\n /* 获取所有信息组 */\n async getAll(): Promise<Array<InfoGroup>> {\n return this.infoGroupRepository.find();\n }\n\n /* 获取指定信息组的信息项，不管信息组状态如何都能获取到 */\n async getInfoItems(id: number): Promise<Array<InfoItem> | undefined> {\n const infoGroup: InfoGroup | undefined = await this.infoGroupRepository.findOne(id, { relations: [\"items\"] });\n return infoGroup ? infoGroup.items : undefined;\n }\n\n /* 创建信息组 */\n async createInfoGroup(name: string): Promise<void> {\n const exist: InfoGroup | undefined = await this.infoGroupRepository.findOne({ name });\n if (exist) {\n throw new HttpException(`给定名称name=${name}信息组已存在`, 407);\n }\n // 方法中创建的信息组都是非默认的，只有模块初始化时写入信息组才是默认的\n const infoGroup: InfoGroup = this.infoGroupRepository.create({ name, default: false, status: true });\n try {\n await this.infoGroupRepository.save(infoGroup);\n } catch (err) {\n throw new HttpException(`数据库错误：${err.toString()}`, 401);\n }\n }\n\n /* 更新信息组 */\n async updateInfoGroup(id: number, name: string): Promise<void> {\n const exist: InfoGroup | undefined = await this.infoGroupRepository.findOne(id);\n if (!exist) {\n throw new HttpException(`给定id=${id}信息组不存在`, 408);\n }\n // 默认信息组无法更新\n if (exist.default) {\n throw new HttpException(\"默认信息组不可更改\", 408);\n }\n // 更新的名称已存在也无法更新\n if (name !== exist.name) {\n const exist1: InfoGroup | undefined = await this.infoGroupRepository.findOne({ name });\n if (exist1) {\n throw new HttpException(`指定名称信息组已存在：${name}`, 408);\n }\n }\n try {\n exist.name = name;\n await this.infoGroupRepository.save(exist);\n } catch (err) {\n throw new HttpException(`数据库错误：${err.toString()}`, 401);\n }\n }\n\n /* 删除信息组，目前由于信息组与信息项是多对多关系，删除信息组只会解除关系，不会删除信息项 */\n async deleteInfoGroup(id: number): Promise<void> {\n const exist: InfoGroup | undefined = await this.infoGroupRepository.findOne(id);\n if (!exist) {\n throw new HttpException(`给定id=${id}信息组不存在`, 408);\n }\n // 默认信息组无法删除\n if (exist.default) {\n throw new HttpException(\"默认信息组不可删除\", 408);\n }\n try {\n await this.infoGroupRepository.remove(exist);\n } catch (err) {\n throw new HttpException(`数据库错误：${err.toString()}`, 401);\n }\n }\n\n /* 向指定信息组添加信息项 */\n async addInfoItem(id: number, infoItemId: number): Promise<void> {\n const group: InfoGroup | undefined = await this.infoGroupRepository.findOne(id, { relations: [\"items\"] });\n if (!group) {\n throw new HttpException(`给定id=${id}信息组不存在`, 408);\n }\n // 不能向默认信息组添加新项\n if (group.default) {\n throw new HttpException(\"默认信息组不可更改\", 408);\n }\n const item: InfoItem | undefined = await this.infoItemRepository.findOne(infoItemId);\n if (!item) {\n throw new HttpException(`指定id=${infoItemId}信息项不存在`, 409);\n }\n // 默认信息项也不能添加到别的组\n if (item.default) {\n throw new HttpException(\"默认信息项不可添加\", 408);\n }\n // 查找是否信息项已经存在于指定信息组中\n const find: InfoItem | undefined = group.items.find(item => {\n return item.id === id;\n });\n // 如果已经存在，报错\n if (find) {\n throw new HttpException(`指定信息项id=${infoItemId}已经存在于指定信息组id=${id}中`, 410);\n }\n try {\n group.items.push(item);\n await this.infoGroupRepository.save(group);\n } catch (err) {\n throw new HttpException(`数据库错误：${err.toString()}`, 401);\n }\n }\n\n /* 从信息组移除信息项 */\n async removeInfoItem(id: number, infoItemId: number): Promise<void> {\n const group: InfoGroup | undefined = await this.infoGroupRepository.findOne(id, { relations: [\"items\"] });\n if (!group) {\n throw new HttpException(`给定id=${id}信息组不存在`, 408);\n }\n // 默认信息组不能更改\n if (group.default) {\n throw new HttpException(\"默认信息组不可更改\", 408);\n }\n // 其他信息组不可能包含默认信息项，因为添加不进去\n const item: InfoItem | undefined = await this.infoItemRepository.findOne(infoItemId);\n if (!item) {\n throw new HttpException(`指定id=${infoItemId}信息项不存在`, 409);\n }\n // 查找是否信息项已经存在于指定信息组中\n const index = group.items.findIndex(item => {\n return item.id === id;\n });\n // 如果信息项不存在信息组中，报错\n if (index < 0) {\n throw new HttpException(`指定信息项id=${infoItemId}不存在于指定信息组id=${id}中`, 411);\n }\n try {\n group.items.splice(index, 1);\n await this.infoGroupRepository.save(group);\n } catch (err) {\n throw new HttpException(`数据库错误：${err.toString()}`, 401);\n }\n }\n}\n"]} |