52638fb4e3
- Page/PageMeta emit {data, meta} with no links key
- RegisterJoinTable fails loud on nil db; document pivot-write contract
41 lines
1018 B
Go
41 lines
1018 B
Go
package lagoon
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// PageMeta is the pagination block of the house REST envelope (DATA-10).
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type PageMeta struct {
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CurrentPage int `json:"current_page"`
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LastPage int `json:"last_page"`
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PerPage int `json:"per_page"`
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Total int64 `json:"total"`
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}
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// Page wraps already-built row DTOs. There is no links field.
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type Page[T any] struct {
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Data []T `json:"data"`
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Meta PageMeta `json:"meta"`
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}
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// Paginate builds {data, meta{current_page,last_page,per_page,total}} from
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// a caller-sliced row set. LastPage is ceil(total/perPage); perPage<=0
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// yields LastPage 1 instead of dividing by zero. Nil rows become [].
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func Paginate[T any](rows []T, page, perPage int, total int64) Page[T] {
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last := 1
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if perPage > 0 {
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last = int((total + int64(perPage) - 1) / int64(perPage))
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if last < 1 {
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last = 1
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}
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}
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if rows == nil {
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rows = []T{}
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}
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return Page[T]{
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Data: rows,
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Meta: PageMeta{
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CurrentPage: page,
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LastPage: last,
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PerPage: perPage,
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Total: total,
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},
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}
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}
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