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
use crate::{
Column, ConjunctRelation, Entity, EntityWriter, Error, PrimaryKey, Relation, RelationType,
};
use sea_query::TableStatement;
use std::collections::HashMap;
#[derive(Clone, Debug)]
pub struct EntityTransformer;
impl EntityTransformer {
pub fn transform(table_stmts: Vec<TableStatement>) -> Result<EntityWriter, Error> {
let mut inverse_relations: HashMap<String, Vec<Relation>> = HashMap::new();
let mut conjunct_relations: HashMap<String, Vec<ConjunctRelation>> = HashMap::new();
let mut entities = HashMap::new();
for table_stmt in table_stmts.into_iter() {
let table_create = match table_stmt {
TableStatement::Create(stmt) => stmt,
_ => {
return Err(Error::TransformError(
"TableStatement should be create".into(),
))
}
};
let table_name = match table_create.get_table_name() {
Some(s) => s,
None => {
return Err(Error::TransformError(
"Table name should not be empty".into(),
))
}
};
let columns: Vec<Column> = table_create
.get_columns()
.iter()
.map(|col_def| col_def.into())
.map(|mut col: Column| {
col.unique = table_create
.get_indexes()
.iter()
.filter(|index| index.is_unique_key())
.map(|index| index.get_index_spec().get_column_names())
.filter(|col_names| col_names.len() == 1 && col_names[0] == col.name)
.count()
> 0;
col
})
.collect();
let mut ref_table_counts: HashMap<String, usize> = HashMap::new();
let relations: Vec<Relation> = table_create
.get_foreign_key_create_stmts()
.iter()
.map(|fk_create_stmt| fk_create_stmt.get_foreign_key())
.map(|tbl_fk| {
let ref_tbl = tbl_fk.get_ref_table().unwrap();
if let Some(count) = ref_table_counts.get_mut(&ref_tbl) {
if *count == 0 {
*count = 1;
}
*count += 1;
} else {
ref_table_counts.insert(ref_tbl, 0);
};
tbl_fk.into()
})
.collect::<Vec<_>>()
.into_iter()
.rev()
.map(|mut rel: Relation| {
rel.self_referencing = rel.ref_table == table_name;
if let Some(count) = ref_table_counts.get_mut(&rel.ref_table) {
rel.num_suffix = *count;
if *count > 0 {
*count -= 1;
}
}
rel
})
.rev()
.collect();
let primary_keys = table_create
.get_indexes()
.iter()
.filter(|index| index.is_primary_key())
.map(|index| {
index
.get_index_spec()
.get_column_names()
.into_iter()
.map(|name| PrimaryKey { name })
.collect::<Vec<_>>()
})
.flatten()
.collect();
let entity = Entity {
table_name: table_name.clone(),
columns,
relations: relations.clone(),
conjunct_relations: vec![],
primary_keys,
};
entities.insert(table_name.clone(), entity.clone());
for (i, mut rel) in relations.into_iter().enumerate() {
if rel.self_referencing {
continue;
}
if rel.num_suffix > 0 {
continue;
}
let is_conjunct_relation = entity.primary_keys.len() == entity.columns.len()
&& rel.columns.len() == 2
&& rel.ref_columns.len() == 2
&& entity.primary_keys.len() == 2;
match is_conjunct_relation {
true => {
let another_rel = entity.relations.get((i == 0) as usize).unwrap();
let conjunct_relation = ConjunctRelation {
via: table_name.clone(),
to: another_rel.ref_table.clone(),
};
if let Some(vec) = conjunct_relations.get_mut(&rel.ref_table) {
vec.push(conjunct_relation);
} else {
conjunct_relations.insert(rel.ref_table, vec![conjunct_relation]);
}
}
false => {
let ref_table = rel.ref_table;
let mut unique = true;
for column in rel.columns.iter() {
if !entity
.columns
.iter()
.filter(|col| col.unique)
.any(|col| col.name.as_str() == column)
{
unique = false;
break;
}
}
let rel_type = if unique {
RelationType::HasOne
} else {
RelationType::HasMany
};
rel.rel_type = rel_type;
rel.ref_table = table_name.clone();
rel.columns = Vec::new();
rel.ref_columns = Vec::new();
if let Some(vec) = inverse_relations.get_mut(&ref_table) {
vec.push(rel);
} else {
inverse_relations.insert(ref_table, vec![rel]);
}
}
}
}
}
for (tbl_name, mut relations) in inverse_relations.into_iter() {
if let Some(entity) = entities.get_mut(&tbl_name) {
entity.relations.append(&mut relations);
}
}
for (tbl_name, mut conjunct_relations) in conjunct_relations.into_iter() {
if let Some(entity) = entities.get_mut(&tbl_name) {
entity.conjunct_relations.append(&mut conjunct_relations);
}
}
Ok(EntityWriter {
entities: entities.into_iter().map(|(_, v)| v).collect(),
})
}
}