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

use heck::{CamelCase, SnakeCase};
use proc_macro2::{Ident, TokenStream};
use quote::{format_ident, quote};
use sea_query::TableForeignKey;

#[derive(Clone, Debug)]
pub enum RelationType {
    HasOne,
    HasMany,
    BelongsTo,
}

#[derive(Clone, Debug)]
pub struct Relation {
    pub(crate) ref_table: String,
    pub(crate) columns: Vec<String>,
    pub(crate) ref_columns: Vec<String>,
    pub(crate) rel_type: RelationType,
}

impl Relation {
    pub fn get_ref_table_snake_case(&self) -> Ident {
        format_ident!("{}", self.ref_table.to_snake_case())
    }

    pub fn get_ref_table_camel_case(&self) -> Ident {
        format_ident!("{}", self.ref_table.to_camel_case())
    }

    pub fn get_def(&self) -> TokenStream {
        let rel_type = self.get_rel_type();
        let ref_table_snake_case = self.get_ref_table_snake_case();
        match self.rel_type {
            RelationType::HasOne | RelationType::HasMany => {
                quote! {
                    Entity::#rel_type(super::#ref_table_snake_case::Entity).into()
                }
            }
            RelationType::BelongsTo => {
                let column_camel_case = self.get_column_camel_case();
                let ref_column_camel_case = self.get_ref_column_camel_case();
                quote! {
                    Entity::#rel_type(super::#ref_table_snake_case::Entity)
                        .from(Column::#column_camel_case)
                        .to(super::#ref_table_snake_case::Column::#ref_column_camel_case)
                        .into()
                }
            }
        }
    }

    pub fn get_rel_type(&self) -> Ident {
        match self.rel_type {
            RelationType::HasOne => format_ident!("has_one"),
            RelationType::HasMany => format_ident!("has_many"),
            RelationType::BelongsTo => format_ident!("belongs_to"),
        }
    }

    pub fn get_column_camel_case(&self) -> Ident {
        format_ident!("{}", self.columns[0].to_camel_case())
    }

    pub fn get_ref_column_camel_case(&self) -> Ident {
        format_ident!("{}", self.ref_columns[0].to_camel_case())
    }
}

impl From<&TableForeignKey> for Relation {
    fn from(tbl_fk: &TableForeignKey) -> Self {
        let ref_table = match tbl_fk.get_ref_table() {
            Some(s) => s,
            None => panic!("RefTable should not be empty"),
        };
        let columns = tbl_fk.get_columns();
        let ref_columns = tbl_fk.get_ref_columns();
        let rel_type = RelationType::BelongsTo;
        Self {
            ref_table,
            columns,
            ref_columns,
            rel_type,
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::{Relation, RelationType};
    use proc_macro2::TokenStream;

    fn setup() -> Vec<Relation> {
        vec![
            Relation {
                ref_table: "fruit".to_owned(),
                columns: vec!["id".to_owned()],
                ref_columns: vec!["cake_id".to_owned()],
                rel_type: RelationType::HasOne,
            },
            Relation {
                ref_table: "filling".to_owned(),
                columns: vec!["filling_id".to_owned()],
                ref_columns: vec!["id".to_owned()],
                rel_type: RelationType::BelongsTo,
            },
            Relation {
                ref_table: "filling".to_owned(),
                columns: vec!["filling_id".to_owned()],
                ref_columns: vec!["id".to_owned()],
                rel_type: RelationType::HasMany,
            },
        ]
    }

    #[test]
    fn test_get_ref_table_snake_case() {
        let relations = setup();
        let snake_cases = vec!["fruit", "filling", "filling"];
        for (rel, snake_case) in relations.into_iter().zip(snake_cases) {
            assert_eq!(rel.get_ref_table_snake_case().to_string(), snake_case);
        }
    }

    #[test]
    fn test_get_ref_table_camel_case() {
        let relations = setup();
        let camel_cases = vec!["Fruit", "Filling", "Filling"];
        for (rel, camel_case) in relations.into_iter().zip(camel_cases) {
            assert_eq!(rel.get_ref_table_camel_case().to_string(), camel_case);
        }
    }

    #[test]
    fn test_get_def() {
        let relations = setup();
        let rel_defs = vec![
            "Entity::has_one(super::fruit::Entity).into()",
            "Entity::belongs_to(super::filling::Entity) \
                .from(Column::FillingId) \
                .to(super::filling::Column::Id) \
                .into()",
            "Entity::has_many(super::filling::Entity).into()",
        ];
        for (rel, rel_def) in relations.into_iter().zip(rel_defs) {
            let rel_def: TokenStream = rel_def.parse().unwrap();

            assert_eq!(rel.get_def().to_string(), rel_def.to_string());
        }
    }

    #[test]
    fn test_get_rel_type() {
        let relations = setup();
        let rel_types = vec!["has_one", "belongs_to", "has_many"];
        for (rel, rel_type) in relations.into_iter().zip(rel_types) {
            assert_eq!(rel.get_rel_type(), rel_type);
        }
    }

    #[test]
    fn test_get_column_camel_case() {
        let relations = setup();
        let cols = vec!["Id", "FillingId", "FillingId"];
        for (rel, col) in relations.into_iter().zip(cols) {
            assert_eq!(rel.get_column_camel_case(), col);
        }
    }

    #[test]
    fn test_get_ref_column_camel_case() {
        let relations = setup();
        let ref_cols = vec!["CakeId", "Id", "Id"];
        for (rel, ref_col) in relations.into_iter().zip(ref_cols) {
            assert_eq!(rel.get_ref_column_camel_case(), ref_col);
        }
    }
}