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query api sort applied to database. #14
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//! # sort | ||
//! All necessery functions for appliying sorting to json results. | ||
use serde_json::Value; | ||
use service::query_api::Queries; | ||
use service::query_api::Sort; | ||
use serde_json::Map; | ||
use std::cmp::Ordering; | ||
|
||
fn compare(a: &Map<String, Value>, b: &Map<String, Value>, sort_key: &String) -> Ordering { | ||
if let Some(a_val) = a.get(sort_key) { | ||
if let Some(b_val) = b.get(sort_key) { | ||
match a_val { | ||
&Value::Array(ref a_arr) => { | ||
if let &Value::Array(ref b_arr) = b_val { | ||
return a_arr.len().cmp(&b_arr.len()); | ||
} else { | ||
return Ordering::Greater; | ||
} | ||
} | ||
&Value::Object(ref a_obj) => { | ||
if let &Value::Object(ref b_obj) = b_val { | ||
return a_obj.len().cmp(&b_obj.len()); | ||
} else { | ||
return Ordering::Greater; | ||
} | ||
} | ||
&Value::Number(ref a_num) => { | ||
if let &Value::Number(ref b_num) = b_val { | ||
// TODO: clear unwraps | ||
return a_num.as_f64() | ||
.unwrap() | ||
.partial_cmp(&b_num.as_f64().unwrap()) | ||
.unwrap(); | ||
} else { | ||
return Ordering::Greater; | ||
} | ||
} | ||
&Value::String(ref a_str) => { | ||
if let &Value::String(ref b_str) = b_val { | ||
return a_str.cmp(&b_str); | ||
} else { | ||
return Ordering::Greater; | ||
} | ||
} | ||
&Value::Bool(a_bool) => { | ||
if let &Value::Bool(b_bool) = b_val { | ||
return a_bool.cmp(&b_bool); | ||
} else { | ||
return Ordering::Greater; | ||
} | ||
} | ||
&Value::Null => { | ||
if let &Value::Null = b_val { | ||
return Ordering::Equal; | ||
} else { | ||
return Ordering::Less; | ||
} | ||
} | ||
} | ||
} else { | ||
Ordering::Greater | ||
} | ||
} else { | ||
if let Some(_) = b.get(sort_key) { | ||
Ordering::Less | ||
} else { | ||
Ordering::Equal | ||
} | ||
} | ||
} | ||
|
||
/// sort on all desired fields fields according to the query api | ||
pub fn apply(obj: &mut Value, queries: &Queries) { | ||
if let &mut Value::Array(ref mut arr) = obj { | ||
let ref sorts = queries.sort; | ||
arr.sort_by(|a: &Value, b: &Value| { | ||
match a { | ||
&Value::Object(ref map_a) => { | ||
if let &Value::Object(ref map_b) = b { | ||
let mut result = Ordering::Equal; | ||
for sort in sorts { | ||
result = match sort { | ||
&Sort::ASC(ref sort_key) => compare(&map_a, &map_b, &sort_key), | ||
&Sort::DSC(ref sort_key) => compare(&map_b, &map_a, &sort_key), | ||
}; | ||
if result != Ordering::Equal { | ||
return result; | ||
} | ||
} | ||
return result; | ||
} else { | ||
Ordering::Greater | ||
} | ||
} | ||
_ => Ordering::Less, | ||
} | ||
}); | ||
}; | ||
} | ||
|
||
|
||
#[cfg(test)] | ||
mod tests { | ||
use super::*; | ||
use serde_json; | ||
use service::query_api::Sort; | ||
|
||
fn get_json() -> Value { | ||
let json_string = r#"[ | ||
{ | ||
"name":"seray", | ||
"age":31, | ||
"active":true, | ||
"password":"123" | ||
}, | ||
{ | ||
"name":"kamil", | ||
"age":900, | ||
"active":false, | ||
"password":"333" | ||
}, | ||
{ | ||
"name":"recep", | ||
"age":25, | ||
"active":true, | ||
"password":"3212" | ||
}, | ||
{ | ||
"name":"hasan", | ||
"age":25, | ||
"active":true, | ||
"password":"3212" | ||
} | ||
]"#; | ||
serde_json::from_str(&json_string).unwrap() | ||
} | ||
|
||
#[test] | ||
fn apply_sort_test() { | ||
let mut queries = Queries::new(); | ||
{ | ||
queries.sort.push(Sort::ASC("age".to_string())); | ||
queries.sort.push(Sort::ASC("name".to_string())); | ||
} | ||
let expected: Value = serde_json::from_str(&r#"[ | ||
{ | ||
"name":"hasan", | ||
"age":25, | ||
"active":true, | ||
"password":"3212" | ||
}, | ||
{ | ||
"name":"recep", | ||
"age":25, | ||
"active":true, | ||
"password":"3212" | ||
}, | ||
{ | ||
"name":"seray", | ||
"age":31, | ||
"active":true, | ||
"password":"123" | ||
}, | ||
{ | ||
"name":"kamil", | ||
"age":900, | ||
"active":false, | ||
"password":"333" | ||
} | ||
]"#) | ||
.unwrap(); | ||
let json = &mut get_json(); | ||
apply(json, &queries); | ||
assert_eq!(json.clone(), expected); | ||
} | ||
} |
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