1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
#lang racket
(provide nutrient-target
nutrient-target?
nutrient-target-id
(rename-out [nutrient-target-effective-on nutrient-target-date]
[nutrient-target-nutrient-values nutrient-target-values])
(contract-out
[create-nutrient-target! (-> string? nutrient-value-hash/c nutrient-target?)]
[get-nutrient-targets (-> (listof nutrient-target?))]
[get-nutrient-target
(->* ()
(#:id (or/c #f exact-nonnegative-integer?) #:effective-on (or/c #f string?))
(or/c nutrient-target? #f))]
[get-nutrient-target-values (-> nutrient-target-or-id/c nutrient-value-hash/c)]
[get-nutrient-target-value (-> nutrient-target-or-id/c nutrient? maybe-nutrient-value?)]
[get-latest-nutrient-target-value (-> nutrient? maybe-nutrient-value?)]
[get-latest-nutrient-target-hash (-> nutrient-value-hash/c)]
[delete-nutrient-target! (-> nutrient-target-or-id/c void?)]))
(require racket/contract
db
sql
"../db/conn.rkt"
"nutrient.rkt")
(struct nutrient-target (id effective-on nutrient-values)
#:transparent
#:property prop:custom-write
(λ (v out _)
(fprintf out "Target #~a on ~a\n" (nutrient-target-id v) (nutrient-target-effective-on v))
(for ([(n v) (in-hash (nutrient-target-nutrient-values v))])
(fprintf out
"~a ~a\n"
(~a (nutrient-canonical-name n) #:min-width 14)
(~a v #:max-width 6 #:align 'right)))))
(define nutrient-target-id? exact-nonnegative-integer?)
(define nutrient-target-or-id/c (or/c nutrient-target? nutrient-target-id?))
(define (->nt-id nt-or-id)
(match nt-or-id
[(? nutrient-target-id? id) id]
[(nutrient-target id _ _) id]))
;; CREATE
(define (create-nutrient-target! effective-on nutrient-values)
(or (get-nutrient-target #:effective-on effective-on)
(with-tx
(query-exec (current-conn) (insert #:into nutrient_targets #:set [effective_on ,effective-on]))
(define nt-id
(query-value (current-conn)
(select id #:from nutrient_targets #:where (= effective_on ,effective-on))))
(query-exec (current-conn)
(insert #:into nutrient_value_sets #:set [nutrient_target_id ,nt-id]))
(define nvs-id
(query-value (current-conn)
(select id #:from nutrient_value_sets #:where (= nutrient_target_id ,nt-id))))
(for ([(n v) (in-hash nutrient-values)])
(query-exec (current-conn)
(insert #:into nutrient_values
#:set [value_set_id ,nvs-id]
[nutrient_id ,(nutrient-id n)]
[value_ppm ,v])))
(get-nutrient-target #:effective-on effective-on))))
;; READ
(define joined
(table-expr-qq (inner-join (inner-join (inner-join (as nutrient_targets nt)
(as nutrient_value_sets nvs)
#:on (= nvs.nutrient_target_id nt.id))
(as nutrient_values nv)
#:on (= nv.value_set_id nvs.id))
(as nutrients n)
#:on (= n.id nv.nutrient_id))))
(define (grouped-row->nutrient-target row)
(match-define (vector nt-id effective-on residuals) row)
(nutrient-target nt-id effective-on (residuals->nutrient-value-hash residuals)))
(define (get-nutrient-targets)
(define grouped-rows
(query-rows (current-conn)
(select nt.id
nt.effective_on
n.id
n.canonical_name
n.french_name
n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:order-by nt.effective_on
#:desc)
#:group '#(0 1)))
(for/list ([row grouped-rows])
(grouped-row->nutrient-target row)))
(define (get-nutrient-target #:id [nt-id #f] #:effective-on [effective-on #f])
(define where
(cond
[(and nt-id effective-on)
(scalar-expr-qq (and (= nt.id ,nt-id) (= nt.effective_on ,effective-on)))]
[nt-id (scalar-expr-qq (= nt.id ,nt-id))]
[effective-on (scalar-expr-qq (= nt.effective_on ,effective-on))]
[else (error 'get-nutrient-target "either #:id or #:effective-on must be provided")]))
(define grouped-rows
(query-rows (current-conn)
(select nt.id
nt.effective_on
n.id
n.canonical_name
n.french_name
n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:where (ScalarExpr:AST ,where)
#:order-by nt.effective_on
#:desc)
#:group '#(0 1)))
(match grouped-rows
['() #f]
[(list row) (grouped-row->nutrient-target row)]
[many (error 'get-nutrient-target "expected 1 nutrient target, got ~a" (length many))]))
(define (get-nutrient-target-values nt-or-id)
(for/hash ([(nutrient-id canonical-name french-name formula value_ppm)
(in-query (current-conn)
(select n.id
n.canonical_name
n.french_name
n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:where (= nt.id ,(->nt-id nt-or-id))))])
(values (nutrient nutrient-id canonical-name french-name formula) value_ppm)))
(define (get-nutrient-target-value nt-or-id nutrient)
(query-maybe-value (current-conn)
(select value_ppm
#:from (TableExpr:AST ,joined)
#:where (and (= nt.id ,(->nt-id nt-or-id))
(= nv.nutrient_id ,(nutrient-id nutrient))))))
(define (get-latest-nutrient-target-value nutrient)
(query-maybe-value (current-conn)
(select value_ppm
#:from (TableExpr:AST ,joined)
#:where (= nv.nutrient_id ,(nutrient-id nutrient))
#:order-by nt.effective_on
#:desc
#:limit 1)))
(define (get-latest-nutrient-target-hash)
(define grouped-rows
(query-rows (current-conn)
(select n.id
n.canonical_name
n.french_name
n.formula
nt.effective_on
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:order-by nt.effective_on
#:desc)
#:group '(#(0 1 2 3))))
(for/hash ([row grouped-rows])
(match-define (vector n-id n-canonical-name n-french-name n-formula residual-rows) row)
;; residual-rows is a non-empty list of vectors: #(effective_on value_ppm)
(match-define (vector _effective-on value-ppm) (first residual-rows))
(values (nutrient n-id n-canonical-name n-french-name n-formula) value-ppm)))
;; UPDATE
;; DELETE
(define (delete-nutrient-target! nt-or-id)
(query-exec (current-conn) (delete #:from nutrient_targets #:where (= id ,(->nt-id nt-or-id)))))
(module+ test
(require rackunit
rackunit/text-ui
"../db/conn.rkt"
"../db/migrations.rkt"
"../models/nutrient.rkt")
(define target-date "2025-09-01")
(run-tests
(test-suite "Nutrient target model"
#:before (λ ()
(connect! #:path 'memory)
(migrate-all!)
(create-nutrient! "Nitrogen" "" "N")
(create-nutrient! "Phosphorus" "" "P")
(create-nutrient! "Potassium" "" "K"))
#:after (λ () (disconnect!))
(test-case "Create target with date and values"
(define nitrogen (get-nutrient #:name "Nitrogen"))
(define phosphorus (get-nutrient #:name "Phosphorus"))
(create-nutrient-target! target-date (hash nitrogen 12.3 phosphorus 4.5))
(check-equal? (length (get-nutrient-targets)) 1)
(define nt (get-nutrient-target #:effective-on target-date))
(check-true (nutrient-target? nt))
(check-equal? (nutrient-target-effective-on nt) target-date))
(test-case "Check all target values"
(define nitrogen (get-nutrient #:name "Nitrogen"))
(define phosphorus (get-nutrient #:name "Phosphorus"))
(define nt (get-nutrient-target #:effective-on target-date))
(check-equal? (get-nutrient-target-value nt nitrogen) 12.3)
(check-equal? (get-nutrient-target-value nt phosphorus) 4.5)
(define ntv (nutrient-target-nutrient-values nt))
(check-equal?
(get-nutrient-target-values nt)
ntv
"return value of get-nutrient-target-values ≠ nutrient-target-values struct accessor")
(check-equal? (hash-count ntv) 2)
(check-equal? (hash-ref ntv nitrogen) 12.3)
(check-equal? (hash-ref ntv phosphorus) 4.5))
(test-case "Retrieve latest target values"
(define nitrogen (get-nutrient #:name "Nitrogen"))
(define phosphorus (get-nutrient #:name "Phosphorus"))
(define second-target-date "2025-09-02")
(create-nutrient-target! second-target-date (hash nitrogen 6.7 phosphorus 8.9))
(check-equal? (get-latest-nutrient-target-value nitrogen) 6.7)
(check-equal? (get-latest-nutrient-target-value phosphorus) 8.9))
(test-case "Delete target and cascade to target values"
(define nt (get-nutrient-target #:effective-on target-date))
(delete-nutrient-target! nt)
(check-false (get-nutrient-target #:id (nutrient-target-id nt)))
(check-equal? (length (get-nutrient-targets))
1
"wrong number of nutrient targets were deleted")
(check-true (hash-empty? (get-nutrient-target-values nt)))))))
|
