Intro: Development of a REST API with Golang from the Alura challenge that i participated in. #alurachallengeback2

Languages and techs: Golang with gorilla mux and gorm, Postgresql and Docker.

Motivation and Goal: It was my first project in backend area and i choose golang because i really enjoy conding with this language. The goal was create a personal finance control that the requests and response were done with json.

Phases: The challenge was divided in three weeks that simulated a real enviroment of a business demand. In the all project, i used the MVC pattern.

The first week - the tasks was create the basis of database with id, describe, value and date, so i choose Postgresql. After it, i need to create a CRUD (create, read, update and delete) routes for incomes and outcomes with one rule: the user didn't POST the same describe in the same month. Then, i created an constrain in database to prevent the user to do that and also in the development the model part, i verified if the rules was being followed, if didn't, i returned an 409 error - Conflict passing the message "This desccribe already exist in this month", as can seen below:

for i := 0; i < len(income); i++ {
	if income[i].Describe == newIncome.Describe {
		log.Println("Error 409: Conflict - This desccribe already exist in this month")
		http.Error(w, conflict+" - This desccribe already exist for this month", http.StatusConflict)
		return
	}
}

In that week, i needed to create the routes to list all incomes and outcomes or one of then by id.

The second week - in that week the goals was to put category for outcomes POST and if this data was sent in blank i needed set automatically the category as "Other", another goals was to create a route that showed the incomes or outcomes for a specifically month and finally to create a resume route that brings the total of income, outcome, and the value gained (income) or spent (outocome) by category. For that week, i need make changes in database, create a new table with the categorys to improve de incomes and outcomes. To show all that resume, i need crate other table like this

create table resumes ( id serial primary key, total_income real, total_outcome real, balance real );

That week like the first one wasn't challenge to me cause i could achieve all the demands whitout much struggles. My knowledge in sql and golang was suficient to finish the work.

The third week -