github.com/forkyid/go-utils/validation

Makes use of four field tags: validate, id, process, json

json is used to get the field name when processing error details. If this tag is empty, or "-", the name defaults to the lowercased struct field name. Returns 400 on error.

validate tags is passed to go-validator. Errors from go-validator is parsed into validation.ErrorDetails.

"id" tags has three possible values: "required", "valid", "allow-zero", and "dive". "required" validates that the field is not empty, and is valid, sets the status code to 400 when empty and 422 when invalid. "valid" behaves similarly to "required" but returns 200 when empty. "allow-zero" allows zero value in id. When used on a slice, the tags will be applied to each element. Using the "dive" tag instructs the validator to recursively dive into slices, maps, and structs. The validator then checks for other tags within the slice/map/struct.

"process" behaves in the same way as validate but returns 422 on error.

validation.ErrorDetails is a map[string]string with an additional method Add(key, value string). Appends detail with "|" as separator. This type can be directly passed to rest.ResponseError as details.