// Compile takes an expression and compiles it to a where clause for use with gorm.DB.Where()
// Returns the number of expected parameters for the query and a slice of errors if something goes wrong
func Compile(where criteria.Expression) (whereClause string, parameters []interface{}, err []error) {
criteria.IteratePostOrder(where, bubbleUpJSONContext)
compiler := newExpressionCompiler()
compiled := where.Accept(&compiler)
return compiled.(string), compiler.parameters, compiler.err
}
// iterate the parent chain to see if this expression references json fields
func isInJSONContext(exp criteria.Expression) bool {
result := false
criteria.IterateParents(exp, func(exp criteria.Expression) bool {
if exp.Annotation(jsonAnnotation) == true {
result = true
return false
}
return true
})
return result
}