github.com/night-codes/go-json@v0.9.15/query.go (about)

     1  package json
     2  
     3  import (
     4  	"github.com/night-codes/go-json/internal/encoder"
     5  )
     6  
     7  type (
     8  	// FieldQuery you can dynamically filter the fields in the structure by creating a FieldQuery,
     9  	// adding it to context.Context using SetFieldQueryToContext and then passing it to MarshalContext.
    10  	// This is a type-safe operation, so it is faster than filtering using map[string]interface{}.
    11  	FieldQuery       = encoder.FieldQuery
    12  	FieldQueryString = encoder.FieldQueryString
    13  )
    14  
    15  var (
    16  	// FieldQueryFromContext get current FieldQuery from context.Context.
    17  	FieldQueryFromContext = encoder.FieldQueryFromContext
    18  	// SetFieldQueryToContext set current FieldQuery to context.Context.
    19  	SetFieldQueryToContext = encoder.SetFieldQueryToContext
    20  )
    21  
    22  // BuildFieldQuery builds FieldQuery by fieldName or sub field query.
    23  // First, specify the field name that you want to keep in structure type.
    24  // If the field you want to keep is a structure type, by creating a sub field query using BuildSubFieldQuery,
    25  // you can select the fields you want to keep in the structure.
    26  // This description can be written recursively.
    27  func BuildFieldQuery(fields ...FieldQueryString) (*FieldQuery, error) {
    28  	query, err := Marshal(fields)
    29  	if err != nil {
    30  		return nil, err
    31  	}
    32  	return FieldQueryString(query).Build()
    33  }
    34  
    35  // BuildSubFieldQuery builds sub field query.
    36  func BuildSubFieldQuery(name string) *SubFieldQuery {
    37  	return &SubFieldQuery{name: name}
    38  }
    39  
    40  type SubFieldQuery struct {
    41  	name string
    42  }
    43  
    44  func (q *SubFieldQuery) Fields(fields ...FieldQueryString) FieldQueryString {
    45  	query, _ := Marshal(map[string][]FieldQueryString{q.name: fields})
    46  	return FieldQueryString(query)
    47  }