Add context to WriteSQL and WriteQuery

CHANGELOG.md

@@ -46,6 +46,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added error constants for matching against both specific and generic unique constraint errors raised by the underlying database driver. (thanks @mbezhanov)
 - Added support for regular expressions in the `only` and `except` table filters. (thanks @mbezhanov)
 
+### Changed
+
+- `context.Context` is now passed to `Query.WriteQuery()` and `Expression.WriteSQL()` methods. This allows for more control over how the query is built and executed.  
+  This change made is possible to delete some hacks and simplify the codebase.
+  - The `Name()` and `NameAs()` methods of Views/Tables no longer need the context argument since the context will be passed when writing the expression. The API then becomes cleaner.
+  - Preloading mods no longer need to store a context internally. `SetLoadContext()` and `GetLoadContext()` have removed.
+  - The `ToExpr` field in `orm.RelSide` which was used for preloading is no longer needed and has been removed.
+
 ### Removed
 
 - Remove MS SQL artifacts. (thanks @mbezhanov)

build.go

@@ -1,15 +1,18 @@
 package bob
 
-import "bytes"
+import (
+	"bytes"
+	"context"
+)
 
 // MustBuild builds a query and panics on error
 // useful for initializing queries that need to be reused
-func MustBuild(q Query) (string, []any) {
-	return MustBuildN(q, 1)
+func MustBuild(ctx context.Context, q Query) (string, []any) {
+	return MustBuildN(ctx, q, 1)
 }
 
-func MustBuildN(q Query, start int) (string, []any) {
-	sql, args, err := BuildN(q, start)
+func MustBuildN(ctx context.Context, q Query, start int) (string, []any) {
+	sql, args, err := BuildN(ctx, q, start)
 	if err != nil {
 		panic(err)
 	}
@@ -18,14 +21,14 @@ func MustBuildN(q Query, start int) (string, []any) {
 }
 
 // Convinient function to build query from start
-func Build(q Query) (string, []any, error) {
-	return BuildN(q, 1)
+func Build(ctx context.Context, q Query) (string, []any, error) {
+	return BuildN(ctx, q, 1)
 }
 
 // Convinient function to build query from a point
-func BuildN(q Query, start int) (string, []any, error) {
+func BuildN(ctx context.Context, q Query, start int) (string, []any, error) {
 	b := &bytes.Buffer{}
-	args, err := q.WriteQuery(b, start)
+	args, err := q.WriteQuery(ctx, b, start)
 
 	return b.String(), args, err
 }

cached.go

@@ -1,16 +1,17 @@
 package bob
 
 import (
+	"context"
 	"fmt"
 	"io"
 )
 
-func Cache(q Query) (BaseQuery[*cached], error) {
-	return CacheN(q, 1)
+func Cache(ctx context.Context, q Query) (BaseQuery[*cached], error) {
+	return CacheN(ctx, q, 1)
 }
 
-func CacheN(q Query, start int) (BaseQuery[*cached], error) {
-	query, args, err := BuildN(q, start)
+func CacheN(ctx context.Context, q Query, start int) (BaseQuery[*cached], error) {
+	query, args, err := BuildN(ctx, q, start)
 	if err != nil {
 		return BaseQuery[*cached]{}, err
 	}
@@ -40,7 +41,7 @@ type cached struct {
 }
 
 // WriteSQL implements Expression.
-func (c *cached) WriteSQL(w io.Writer, d Dialect, start int) ([]any, error) {
+func (c *cached) WriteSQL(ctx context.Context, w io.Writer, d Dialect, start int) ([]any, error) {
 	if start != c.start {
 		return nil, WrongStartError{Expected: c.start, Got: start}
 	}

clause/combine.go

@@ -1,6 +1,7 @@
 package clause
 
 import (
+	"context"
 	"errors"
 	"io"
 
@@ -25,7 +26,7 @@ func (s *Combine) SetCombine(c Combine) {
 	*s = c
 }
 
-func (s Combine) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (s Combine) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	if s.Strategy == "" {
 		return nil, ErrNoCombinationStrategy
 	}
@@ -38,7 +39,7 @@ func (s Combine) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error)
 		w.Write([]byte(" "))
 	}
 
-	args, err := bob.Express(w, d, start, s.Query)
+	args, err := bob.Express(ctx, w, d, start, s.Query)
 	if err != nil {
 		return nil, err
 	}

clause/conflict.go

@@ -1,6 +1,7 @@
 package clause
 
 import (
+	"context"
 	"io"
 
 	"github.com/stephenafamo/bob"
@@ -17,24 +18,24 @@ func (c *Conflict) SetConflict(conflict Conflict) {
 	*c = conflict
 }
 
-func (c Conflict) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (c Conflict) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	w.Write([]byte("ON CONFLICT"))
 
-	args, err := bob.ExpressIf(w, d, start, c.Target, true, "", "")
+	args, err := bob.ExpressIf(ctx, w, d, start, c.Target, true, "", "")
 	if err != nil {
 		return nil, err
 	}
 
 	w.Write([]byte(" DO "))
 	w.Write([]byte(c.Do))
 
-	setArgs, err := bob.ExpressIf(w, d, start+len(args), c.Set, len(c.Set.Set) > 0, " SET\n", "")
+	setArgs, err := bob.ExpressIf(ctx, w, d, start+len(args), c.Set, len(c.Set.Set) > 0, " SET\n", "")
 	if err != nil {
 		return nil, err
 	}
 	args = append(args, setArgs...)
 
-	whereArgs, err := bob.ExpressIf(w, d, start+len(args), c.Where,
+	whereArgs, err := bob.ExpressIf(ctx, w, d, start+len(args), c.Where,
 		len(c.Where.Conditions) > 0, "\n", "")
 	if err != nil {
 		return nil, err
@@ -50,17 +51,17 @@ type ConflictTarget struct {
 	Where      []any
 }
 
-func (c ConflictTarget) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (c ConflictTarget) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	if c.Constraint != "" {
-		return bob.ExpressIf(w, d, start, c.Constraint, true, " ON CONSTRAINT ", "")
+		return bob.ExpressIf(ctx, w, d, start, c.Constraint, true, " ON CONSTRAINT ", "")
 	}
 
-	args, err := bob.ExpressSlice(w, d, start, c.Columns, " (", ", ", ")")
+	args, err := bob.ExpressSlice(ctx, w, d, start, c.Columns, " (", ", ", ")")
 	if err != nil {
 		return nil, err
 	}
 
-	whereArgs, err := bob.ExpressSlice(w, d, start+len(args), c.Where, " WHERE ", " AND ", "")
+	whereArgs, err := bob.ExpressSlice(ctx, w, d, start+len(args), c.Where, " WHERE ", " AND ", "")
 	if err != nil {
 		return nil, err
 	}

clause/cte.go

@@ -1,6 +1,7 @@
 package clause
 
 import (
+	"context"
 	"fmt"
 	"io"
 
@@ -16,9 +17,9 @@ type CTE struct {
 	Cycle        CTECycle
 }
 
-func (c CTE) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (c CTE) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	w.Write([]byte(c.Name))
-	_, err := bob.ExpressSlice(w, d, start, c.Columns, "(", ", ", ")")
+	_, err := bob.ExpressSlice(ctx, w, d, start, c.Columns, "(", ", ", ")")
 	if err != nil {
 		return nil, err
 	}
@@ -36,20 +37,20 @@ func (c CTE) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	}
 
 	w.Write([]byte("("))
-	args, err := c.Query.WriteQuery(w, start)
+	args, err := c.Query.WriteQuery(ctx, w, start)
 	if err != nil {
 		return nil, err
 	}
 	w.Write([]byte(")"))
 
-	searchArgs, err := bob.ExpressIf(w, d, start+len(args), c.Search,
+	searchArgs, err := bob.ExpressIf(ctx, w, d, start+len(args), c.Search,
 		len(c.Search.Columns) > 0, "\n", "")
 	if err != nil {
 		return nil, err
 	}
 	args = append(args, searchArgs...)
 
-	cycleArgs, err := bob.ExpressIf(w, d, start+len(args), c.Cycle,
+	cycleArgs, err := bob.ExpressIf(ctx, w, d, start+len(args), c.Cycle,
 		len(c.Cycle.Columns) > 0, "\n", "")
 	if err != nil {
 		return nil, err
@@ -70,11 +71,11 @@ type CTESearch struct {
 	Set     string
 }
 
-func (c CTESearch) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (c CTESearch) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	// [ SEARCH { BREADTH | DEPTH } FIRST BY column_name [, ...] SET search_seq_col_name ]
 	fmt.Fprintf(w, "SEARCH %s FIRST BY ", c.Order)
 
-	args, err := bob.ExpressSlice(w, d, start, c.Columns, "", ", ", "")
+	args, err := bob.ExpressSlice(ctx, w, d, start, c.Columns, "", ", ", "")
 	if err != nil {
 		return nil, err
 	}
@@ -92,25 +93,25 @@ type CTECycle struct {
 	DefaultVal any
 }
 
-func (c CTECycle) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (c CTECycle) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	//[ CYCLE column_name [, ...] SET cycle_mark_col_name [ TO cycle_mark_value DEFAULT cycle_mark_default ] USING cycle_path_col_name ]
 	w.Write([]byte("CYCLE "))
 
-	args, err := bob.ExpressSlice(w, d, start, c.Columns, "", ", ", "")
+	args, err := bob.ExpressSlice(ctx, w, d, start, c.Columns, "", ", ", "")
 	if err != nil {
 		return nil, err
 	}
 
 	fmt.Fprintf(w, " SET %s", c.Set)
 
-	markArgs, err := bob.ExpressIf(w, d, start+len(args), c.SetVal,
+	markArgs, err := bob.ExpressIf(ctx, w, d, start+len(args), c.SetVal,
 		c.SetVal != nil, " TO ", "")
 	if err != nil {
 		return nil, err
 	}
 	args = append(args, markArgs...)
 
-	defaultArgs, err := bob.ExpressIf(w, d, start+len(args), c.DefaultVal,
+	defaultArgs, err := bob.ExpressIf(ctx, w, d, start+len(args), c.DefaultVal,
 		c.DefaultVal != nil, " DEFAULT ", "")
 	if err != nil {
 		return nil, err

clause/fetch.go

@@ -1,6 +1,7 @@
 package clause
 
 import (
+	"context"
 	"io"
 	"strconv"
 
@@ -16,7 +17,7 @@ func (f *Fetch) SetFetch(fetch Fetch) {
 	*f = fetch
 }
 
-func (f Fetch) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (f Fetch) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	if f.Count == nil {
 		return nil, nil
 	}

clause/for.go

@@ -1,6 +1,7 @@
 package clause
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -32,7 +33,7 @@ func (f *For) SetFor(lock For) {
 	*f = lock
 }
 
-func (f For) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (f For) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	if f.Strength == "" {
 		return nil, nil
 	}
@@ -42,7 +43,7 @@ func (f For) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
 		fmt.Fprintf(w, "%s ", f.Strength)
 	}
 
-	args, err := bob.ExpressSlice(w, d, start, f.Tables, "OF ", ", ", "")
+	args, err := bob.ExpressSlice(ctx, w, d, start, f.Tables, "OF ", ", ", "")
 	if err != nil {
 		return nil, err
 	}

clause/frame.go

@@ -1,6 +1,7 @@
 package clause
 
 import (
+	"context"
 	"io"
 
 	"github.com/stephenafamo/bob"
@@ -34,7 +35,7 @@ func (f *Frame) SetExclusion(excl string) {
 	f.Exclusion = excl
 }
 
-func (f Frame) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
+func (f Frame) WriteSQL(ctx context.Context, w io.Writer, d bob.Dialect, start int) ([]any, error) {
 	if f.Mode == "" {
 		f.Mode = "RANGE"
 	}
@@ -52,19 +53,19 @@ func (f Frame) WriteSQL(w io.Writer, d bob.Dialect, start int) ([]any, error) {
 		w.Write([]byte("BETWEEN "))
 	}
 
-	startArgs, err := bob.Express(w, d, start, f.Start)
+	startArgs, err := bob.Express(ctx, w, d, start, f.Start)
 	if err != nil {
 		return nil, err
 	}
 	args = append(args, startArgs...)
 
-	endArgs, err := bob.ExpressIf(w, d, start, f.End, f.End != nil, " AND ", "")
+	endArgs, err := bob.ExpressIf(ctx, w, d, start, f.End, f.End != nil, " AND ", "")
 	if err != nil {
 		return nil, err
 	}
 	args = append(args, endArgs...)
 
-	_, err = bob.ExpressIf(w, d, start, f.Exclusion, f.Exclusion != "", " EXCLUDE ", "")
+	_, err = bob.ExpressIf(ctx, w, d, start, f.Exclusion, f.Exclusion != "", " EXCLUDE ", "")
 	if err != nil {
 		return nil, err
 	}