小编nit*_*nwe的帖子

我有一个Recipe模型,它包含一个IngredientType对象的M2M字段.这个字段,也就是ingredient_list,通过一个Ingredient对象使用臭名昭着的"通过"模型,该对象将额外的数据添加到我的IngredientType中.这些是我的课程:

class Recipe(models.Model):
    user_profile = models.ForeignKey(UserProfile, null=True, blank = True)
    name = models.CharField(max_length=200)
    photo1 = models.ImageField( upload_to = 'images/recipies', help_text="This photo will show by default")
    ingredient_list = models.ManyToManyField(IngredientType,through='Ingredient')

class Ingredient(models.Model):
    ingredient_type = models.ForeignKey(IngredientType)
    recipe = models.ForeignKey(Recipe)
    amount = models.IntegerField()
    units = models.CharField(max_length=4,choices=UNIT, 
                               default=None, null=True, blank = True)

class IngredientType(models.Model):
    name = models.CharField(max_length=200)
    plural_name = models.CharField(max_length=200)
    photo = models.ImageField( upload_to = 'images/ingredients')
    is_main = models.BooleanField()

我尝试使用rest_framework序列化它们:

class IngredientTypeSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = IngredientType
        fields=('name', 'plural_name', 'photo', 'is_main')

class IngredientSerializer(serializers.HyperlinkedModelSerializer):
    ingredient_type = …

我一直在使用viewPager遇到麻烦我正试图添加到我的应用程序中.

我有一个SearchResultActivity,里面有一个抽屉.具有以下布局:

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<FrameLayout
    android:id="@+id/content_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<ListView
    android:id="@+id/left_drawer"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:background="#111"
    android:choiceMode="singleChoice"
    android:divider="@android:color/transparent"
    android:dividerHeight="0dp" />

因为我正在使用片段,在第一次到达此活动时,我打开使用事务在Activity的onCreate方法中打开RecipeHeadlinesFragment:

    @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.drawer_main);
    mSearchType = getIntent().getIntExtra(SEARCH_TYPE, -1);
    if (mSearchType == ICON_SEARCH) {
        mVeggieNamesIcons = getIntent().getStringArrayListExtra(
                VEGGIE_NAME_ARR);
        mVeggieUrlsIcons = getIntent().getStringArrayListExtra(
                VEGGIE_URLS_ARR);
    } else if (mSearchType == QUERY_SEARCH) {
        mQuery = getIntent().getStringExtra(QUERY);
    }
    // Generate title
    title = new String[] { "Search for a recipe", "My profile",
            "Title Fragment 3" };

    // Generate …