How do I match a key with an object with sequelize? - mysql

Question

Current Situation
My current Sequelize Controller looks like the below:
const getSum = async(req, res) => {
const expenses = await Expense.findAll({
attributes: [
'datepick',
'itemized_expense',
[sequelize.fn('SUM', sequelize.col('expense_amount')), 'itemized_expense_sum']],
group: ['datepick', "itemized_expense"]
})
res.status(200).json(expenses)
When I use postman, the cCurrent JSON response is below:
[
{
"datepick": "2022-10-03",
"itemized_expense": "marketing",
"itemized_expense_sum": "4000"
},
{
"datepick": "2022-10-03",
"itemized_expense": "development",
"itemized_expense_sum": "8000"
},
{
"datepick": "2022-10-03",
"itemized_expense": "welfare",
"itemized_expense_sum": "1111"
},
{
"datepick": "2022-11-14",
"itemized_expense": "wages",
"itemized_expense_sum": "6000"
},
{
"datepick": "2022-10-03",
"itemized_expense": "wages",
"itemized_expense_sum": "1111"
},
{
"datepick": "2022-11-15",
"itemized_expense": "development",
"itemized_expense_sum": "1000"
}
]
The Problem
How do I change my Sequelize Controller so that the response looks like the below?
{
key: '10/20', /*this is datepick from above*/
data: {
wages: 500000, /*this is a key-value pair of itemized_expense & itemized_expense_sum from above*/
welfare: 300000,
marketing: 500000,
development: 200000,
rental: 150000
}
},
{
key: '10/21',
data: {
wages: 300000,
welfare: 400000,
marketing: 100000,
development: 500000,
rental: 250000
}
},
I was trying to use Object.key() and map but I'm not sure if that is correct

Answer 1

You can use lodash package to group and rearrange items:
const items = [
{
"datepick": "2022-10-03",
"itemized_expense": "marketing",
"itemized_expense_sum": "4000"
},
{
"datepick": "2022-10-03",
"itemized_expense": "development",
"itemized_expense_sum": "8000"
},
{
"datepick": "2022-10-03",
"itemized_expense": "welfare",
"itemized_expense_sum": "1111"
},
{
"datepick": "2022-11-14",
"itemized_expense": "wages",
"itemized_expense_sum": "6000"
},
{
"datepick": "2022-10-03",
"itemized_expense": "wages",
"itemized_expense_sum": "1111"
},
{
"datepick": "2022-11-15",
"itemized_expense": "development",
"itemized_expense_sum": "1000"
}
]
const groupedItems = _.groupBy(items, x => x.datepick)
const keys = Object.keys(groupedItems)
const mappedItems = keys.map(x => ({
key: x,
data: _.fromPairs(groupedItems[x].map(item => [item.itemized_expense, item.itemized_expense_sum])
)
}))
result = mappedItems
result:
[
{
"key": "2022-10-03",
"data": {
"marketing": "4000",
"development": "8000",
"welfare": "1111",
"wages": "1111"
}
},
{
"key": "2022-11-14",
"data": {
"wages": "6000"
}
},
{
"key": "2022-11-15",
"data": {
"development": "1000"
}
}
]
You can try this code in this lodash sandbox