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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | 18x 18x 18x 18x 18x 18x 18x 34x 34x 34x 34x 34x 34x 9x 9x 8x 8x 7x 7x 1x 1x 3x 3x 4x 13x | /**
* User interest service.
* @packageDocumentation
*/
import { Injectable, Inject, forwardRef } from '@nestjs/common';
import { DBService } from '../db/db.service';
import { UserService } from '../user/user.service';
import { DepartmentService } from '../department/department.service';
import { NBUserInterest } from './user-interest.interface';
import { ServiceException } from '../service.exception';
/**
* User interest table name.
*/
export const userInterestTableName = 'NB_USER_INTEREST';
/**
* User interest table service.
*/
@Injectable()
export class UserInterestService {
constructor(
@Inject(forwardRef(() => DBService))
private readonly dbService: DBService,
@Inject(forwardRef(() => UserService))
private readonly userService: UserService,
@Inject(forwardRef(() => DepartmentService))
private readonly departmentService: DepartmentService,
) {}
/**
* Note a user's interest in a department.
*
* @param userID The user's ID.
* @param departmentID The department's ID.
* @returns The new user interest record.
*/
public async noteInterest(
userID: string,
departmentID: number,
): Promise<NBUserInterest> {
const userExists = await this.userService.userExists(userID);
if (userExists) {
const departmentExists = await this.departmentService.departmentExists(
departmentID,
);
if (departmentExists) {
await this.dropInterest(userID, departmentID);
return this.dbService.create<NBUserInterest>(userInterestTableName, {
userID,
departmentID,
});
} else {
throw new ServiceException('Department does not exist');
}
} else {
throw new ServiceException('User does not exist');
}
}
/**
* Determine whether or not a user is interested in a department.
*
* @param userID The user's ID.
* @param departmentID The department's ID.
* @returns Whether or not the user is interested in the department.
*/
public async isInterested(
userID: string,
departmentID: number,
): Promise<boolean> {
const userInterest = await this.dbService.getByFields<NBUserInterest>(
userInterestTableName,
{ userID, departmentID },
);
return !!userInterest;
}
/**
* Get all of a user's departmental interests.
*
* @param userID The user's ID.
* @returns All of the user's departmental interests.
*/
public async getUserInterests(userID: string): Promise<NBUserInterest[]> {
return this.dbService.listByFields<NBUserInterest>(
userInterestTableName,
{ userID },
{ fieldName: 'interestTime', sortOrder: 'ASC' },
);
}
/**
* Delete a user's interest in a department.
*
* @param userID The user's ID.
* @param departmentID The department's ID.
*/
public async dropInterest(
userID: string,
departmentID: number,
): Promise<void> {
await this.dbService.deleteByFields(userInterestTableName, {
userID,
departmentID,
});
}
}
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