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add offset step to query builder (#1049)

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Summary:
Pull Request resolved: https://github.com/facebookexternal/fbc/pull/1049

Useful for real paging

Reviewed By: noamsch

Differential Revision: D16003607

fbshipit-source-id: 6a85d0e3d71a2582bc3cd8f1d66748dda4f2a10e
This commit is contained in:
Ariel Mashraki
2019-06-26 01:15:58 -07:00
committed by Facebook Github Bot
parent 6c2813b7b5
commit 37ae2b744e
14 changed files with 235 additions and 59 deletions
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7
entc/gen/template/dialect/gremlin/query.tmpl
View File

@@ -65,7 +65,12 @@ func ({{ $receiver }} *{{ $builder }}) gremlinQuery() *dsl.Traversal {
p.Gremlin(v)
}
}
if limit := {{ $receiver }}.limit; limit != nil {
switch limit, offset := {{ $receiver }}.limit, {{ $receiver }}.offset; {
case limit != nil && offset != nil:
v.Range(*offset, *offset + *limit)
case offset != nil:
v.Range(*offset, math.MaxInt64)
case limit != nil:
v.Limit(*limit)
}
if unique := {{ $receiver }}.unique; len(unique) == 0 {

5
entc/gen/template/dialect/sql/query.tmpl
View File

@@ -80,6 +80,11 @@ func ({{ $receiver }} *{{ $builder }}) sqlQuery() *sql.Selector {
for _, p := range {{ $receiver }}.order {
p.SQL(selector)
}
if offset := {{ $receiver }}.offset; offset != nil {
// limit is mandatory for offset clause. We start
// with default value, and override it below if needed.
selector.Offset(*offset).Limit(math.MaxInt64)
}
if limit := {{ $receiver }}.limit; limit != nil {
selector.Limit(*limit)
}