All files / src/common/pagination pagination.dto.ts

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import { IsInt, IsOptional, Max, Min } from 'class-validator';
import { Type } from 'class-transformer';
 
export class PaginationDto {
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  page?: number = 1;
 
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  @Max(200)
  limit?: number = 20;
 
  @IsOptional()
  sortBy?: string;
 
  @IsOptional()
  sortOrder?: 'asc' | 'desc' = 'asc';
}
 
export interface PaginatedResult<T> {
  data: T[];
  meta: {
    page: number;
    limit: number;
    total: number;
    totalPages: number;
    hasNextPage: boolean;
    hasPrevPage: boolean;
  };
}
 
export function buildPaginatedResult<T>(
  data: T[],
  total: number,
  page: number,
  limit: number,
): PaginatedResult<T> {
  const totalPages = Math.ceil(total / limit);
  return {
    data,
    meta: {
      page,
      limit,
      total,
      totalPages,
      hasNextPage: page < totalPages,
      hasPrevPage: page > 1,
    },
  };
}
 
export function paginationToSkipLimit(pagination: PaginationDto): {
  skip: number;
  limit: number;
} {
  const page = pagination.page ?? 1;
  const limit = pagination.limit ?? 20;
  return { skip: (page - 1) * limit, limit };
}