[英]Django Python - How to add foreign key to table displayed in admin page
所以我在一個MySQL數據庫中有4個表。 在我使用Django創建的應用程序下,使用Django管理數據庫。 這是文件models.py中與數據庫表相對應的4個類中的2個:
from __future__ import unicode_literals
from django.db import models
class Pdb(models.Model):
id_pdb_chain = models.CharField(db_column='id_PDB_chain', primary_key=True, max_length=5) # Field name made lowercase.
id_pdb = models.CharField(db_column='id_PDB', max_length=4) # Field name made lowercase.
chaine = models.CharField(max_length=10)
header = models.CharField(max_length=255)
sequence_proteine = models.TextField(db_column='sequence_Proteine') # Field name made lowercase.
start_seq = models.IntegerField()
taille_proteine = models.IntegerField(db_column='taille_Proteine') # Field name made lowercase.
resolution_pdb = models.FloatField(db_column='resolution_PDB') # Field name made lowercase.
meth_res = models.ForeignKey('MethodesRes', models.DO_NOTHING, db_column='meth_Res') # Field name made lowercase.
def __unicode__(self):
return self.id_pdb
class Meta:
managed = False
db_table = 'PDB'
class StructSec(models.Model):
id_struct_sec = models.AutoField(primary_key=True)
start_pred = models.IntegerField()
structure_predite = models.TextField(db_column='structure_Predite') # Field name made lowercase.
nombre_ppii = models.IntegerField(db_column='nombre_PPII') # Field name made lowercase.
pourcentage_ppii = models.FloatField(db_column='pourcentage_PPII') # Field name made lowercase.
angle_phi = models.TextField()
angle_psi = models.TextField()
id_pdb_chain = models.ForeignKey(Pdb, models.DO_NOTHING, db_column='id_PDB_chain') # Field name made lowercase.
nom_analyse = models.ForeignKey(MethodesAnalyse, models.DO_NOTHING, db_column='nom_Analyse') # Field name made lowercase.
def __unicode__(self):
return self.structure_predite
class Meta:
managed = False
db_table = 'struct_sec'
如您所見,我已經找到一種在管理頁面中為每個表顯示字段的方法,其中每個表都包含此部分:
def __unicode__(self):
return self.structure_predite
但是,當我想用“ StructSec”類中的主鍵替換“ structure_predite”時,如下所示:
def __unicode__(self):
return self.id_struct_sec
Django返回此錯誤:
TypeError: coercing to Unicode: need string or buffer, long found
我還必須提到,我在“ admin.py”文件中做了一些修改:
from django.contrib import admin
from .models import Pdb, MethodesAnalyse, MethodesRes, StructSec
class PdbInline(admin.TabularInline):
model = Pdb
class PdbAdmin(admin.ModelAdmin):
list_display = ('id_pdb','header','chaine','taille_proteine','meth_res')
list_filter = ['chaine','meth_res']
search_fields = ['id_pdb_chain','header']
class MethodesAnalyseInline(admin.TabularInline):
model = MethodesAnalyse
class MethodesAnalyseAdmin(admin.ModelAdmin):
list_display = ('nom_analyse')
class MethodesResInline(admin.TabularInline):
model = MethodesRes
class MethodesResAdmin(admin.ModelAdmin):
list_display = ('meth_res')
class StructSecInline(admin.TabularInline):
model = MethodesRes
class StructSecAdmin(admin.ModelAdmin):
list_display = ('id_struct_sec','nombre_PPII','pourcentage_PPII','id_PDB','nom_Analyse')
search_fields = ['nombre_ppii','pourcentage_ppii']
admin.site.register(Pdb,PdbAdmin)
admin.site.register(MethodesAnalyse)
admin.site.register(MethodesRes)
admin.site.register(StructSec)
知道了這一點,我的問題很簡單:如何在相應的管理表中顯示StructSec類中的自動遞增ID(主鍵)而不會出現錯誤?
我認為錯誤是由於None值引起的。 Python無法轉換None。
將您的unicode定義替換為'str'為:
def __str__(self):
return self.id_struct_sec
Sijan的答案是正確的,我只想補充一點,要使鏈接有效,您可能還必須這樣做:
def __str__(self):
return str(self.id_struct_sec)
如果返回中沒有“ str()”,則鏈接不起作用,並且在單擊時返回錯誤。
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