Issue using HttpParams
Angular Version: 4.3
I have a screen with 3 search fields: id, name and category. I do the research as the fields are filled out.
I would like a better suggestion for this code, because if I had several fields of research, it would be an impracticable implementation for the amount of combinations. The fact that the HttpParams object is immutable is that it is leaving me trapped in the field combinations, since I can not concatenate as I check if the field has been filled.
See the code below:
pesquisaRestaurantes(id ? : string, name ? : string, category ? : string): Observable < Restaurant > {
let params: HttpParams = undefined;
if (id) {
params = new HttpParams().append('id', id)
} else {
if (name && category) {
params = new HttpParams().append('name', name).append('category', category)
} else if (name) {
params = new HttpParams().append('name', name)
} else if (category) {
params = new HttpParams().append('category', category)
}
}
return this.http.get < Restaurant > (`${MEAT_API}/restaurants`, {
params: params
})
}
I look forward to a better implementation. Thank you.
angular
edited Nov 23 '18 at 7:15
barbsan
2,21811122
asked Nov 23 '18 at 1:38
Robson Brito
111
add a comment |
Angular Version: 4.3
I have a screen with 3 search fields: id, name and category. I do the research as the fields are filled out.
I would like a better suggestion for this code, because if I had several fields of research, it would be an impracticable implementation for the amount of combinations. The fact that the HttpParams object is immutable is that it is leaving me trapped in the field combinations, since I can not concatenate as I check if the field has been filled.
See the code below:
pesquisaRestaurantes(id ? : string, name ? : string, category ? : string): Observable < Restaurant > {
let params: HttpParams = undefined;
if (id) {
params = new HttpParams().append('id', id)
} else {
if (name && category) {
params = new HttpParams().append('name', name).append('category', category)
} else if (name) {
params = new HttpParams().append('name', name)
} else if (category) {
params = new HttpParams().append('category', category)
}
}
return this.http.get < Restaurant > (`${MEAT_API}/restaurants`, {
params: params
})
}
I look forward to a better implementation. Thank you.
angular
edited Nov 23 '18 at 7:15
barbsan
2,21811122
asked Nov 23 '18 at 1:38
Robson Brito
111
add a comment |
Angular Version: 4.3
I have a screen with 3 search fields: id, name and category. I do the research as the fields are filled out.
I would like a better suggestion for this code, because if I had several fields of research, it would be an impracticable implementation for the amount of combinations. The fact that the HttpParams object is immutable is that it is leaving me trapped in the field combinations, since I can not concatenate as I check if the field has been filled.
See the code below:
pesquisaRestaurantes(id ? : string, name ? : string, category ? : string): Observable < Restaurant > {
let params: HttpParams = undefined;
if (id) {
params = new HttpParams().append('id', id)
} else {
if (name && category) {
params = new HttpParams().append('name', name).append('category', category)
} else if (name) {
params = new HttpParams().append('name', name)
} else if (category) {
params = new HttpParams().append('category', category)
}
}
return this.http.get < Restaurant > (`${MEAT_API}/restaurants`, {
params: params
})
}
I look forward to a better implementation. Thank you.
angular
edited Nov 23 '18 at 7:15
barbsan
2,21811122
asked Nov 23 '18 at 1:38
Robson Brito
111
Angular Version: 4.3
I have a screen with 3 search fields: id, name and category. I do the research as the fields are filled out.
I would like a better suggestion for this code, because if I had several fields of research, it would be an impracticable implementation for the amount of combinations. The fact that the HttpParams object is immutable is that it is leaving me trapped in the field combinations, since I can not concatenate as I check if the field has been filled.
See the code below:
pesquisaRestaurantes(id ? : string, name ? : string, category ? : string): Observable < Restaurant > {
let params: HttpParams = undefined;
if (id) {
params = new HttpParams().append('id', id)
} else {
if (name && category) {
params = new HttpParams().append('name', name).append('category', category)
} else if (name) {
params = new HttpParams().append('name', name)
} else if (category) {
params = new HttpParams().append('category', category)
}
}
return this.http.get < Restaurant > (`${MEAT_API}/restaurants`, {
params: params
})
}
I look forward to a better implementation. Thank you.
angular
angular
edited Nov 23 '18 at 7:15
barbsan
2,21811122
asked Nov 23 '18 at 1:38
Robson Brito
111
edited Nov 23 '18 at 7:15
barbsan
2,21811122
asked Nov 23 '18 at 1:38
Robson Brito
111
edited Nov 23 '18 at 7:15
barbsan
2,21811122
edited Nov 23 '18 at 7:15
barbsan
2,21811122
edited Nov 23 '18 at 7:15
barbsan
2,21811122
2,21811122
asked Nov 23 '18 at 1:38
Robson Brito
111
asked Nov 23 '18 at 1:38
Robson Brito
111
asked Nov 23 '18 at 1:38
Robson Brito
111
111
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Should work:
...
params = new HttpParams();
If(name) params = params.append('name', name);
If(category) params = params.append('category', category);
...
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
Já tentei esta alternativa, mas não funciona porque o objeto params é imutável. A partir do momento em que chamo pelo método .append ou .set, o objeto é clonado e devolvido esta nova instância somente com este último parâmetro informado.
– Robson Brito
Nov 23 '18 at 12:30
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Should work:
...
params = new HttpParams();
If(name) params = params.append('name', name);
If(category) params = params.append('category', category);
...
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
Já tentei esta alternativa, mas não funciona porque o objeto params é imutável. A partir do momento em que chamo pelo método .append ou .set, o objeto é clonado e devolvido esta nova instância somente com este último parâmetro informado.
– Robson Brito
Nov 23 '18 at 12:30
add a comment |
Should work:
...
params = new HttpParams();
If(name) params = params.append('name', name);
If(category) params = params.append('category', category);
...
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
Já tentei esta alternativa, mas não funciona porque o objeto params é imutável. A partir do momento em que chamo pelo método .append ou .set, o objeto é clonado e devolvido esta nova instância somente com este último parâmetro informado.
– Robson Brito
Nov 23 '18 at 12:30
add a comment |
Should work:
...
params = new HttpParams();
If(name) params = params.append('name', name);
If(category) params = params.append('category', category);
...
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
Should work:
...
params = new HttpParams();
If(name) params = params.append('name', name);
If(category) params = params.append('category', category);
...
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
answered Nov 23 '18 at 4:50
Alexander Poshtaruk
1,292510
1,292510
Já tentei esta alternativa, mas não funciona porque o objeto params é imutável. A partir do momento em que chamo pelo método .append ou .set, o objeto é clonado e devolvido esta nova instância somente com este último parâmetro informado.
– Robson Brito
Nov 23 '18 at 12:30
add a comment |
Já tentei esta alternativa, mas não funciona porque o objeto params é imutável. A partir do momento em que chamo pelo método .append ou .set, o objeto é clonado e devolvido esta nova instância somente com este último parâmetro informado.
– Robson Brito
Nov 23 '18 at 12:30
Já tentei esta alternativa, mas não funciona porque o objeto params é imutável. A partir do momento em que chamo pelo método .append ou .set, o objeto é clonado e devolvido esta nova instância somente com este último parâmetro informado.
– Robson Brito
Nov 23 '18 at 12:30
Já tentei esta alternativa, mas não funciona porque o objeto params é imutável. A partir do momento em que chamo pelo método .append ou .set, o objeto é clonado e devolvido esta nova instância somente com este último parâmetro informado.
– Robson Brito
Nov 23 '18 at 12:30
add a comment |
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