How to use the wagtail.wagtailcore function in wagtail

('signup_link', models.URLField(blank=True)),
                ('feed_image', models.ForeignKey(related_name='+', on_delete=django.db.models.deletion.SET_NULL, blank=True, to='wagtailimages.Image', null=True)),
            ],
            options={
                'abstract': False,
            },
            bases=('wagtailcore.page',),
        ),
        migrations.CreateModel(
            name='EventPageCarouselItem',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('sort_order', models.IntegerField(null=True, editable=False, blank=True)),
                ('link_external', models.URLField(verbose_name=b'External link', blank=True)),
                ('embed_url', models.URLField(verbose_name=b'Embed URL', blank=True)),
                ('caption', wagtail.wagtailcore.fields.RichTextField(blank=True)),
                ('image', models.ForeignKey(related_name='+', on_delete=django.db.models.deletion.SET_NULL, blank=True, to='wagtailimages.Image', null=True)),
                ('link_document', models.ForeignKey(related_name='+', blank=True, to='wagtaildocs.Document', null=True)),
                ('link_page', models.ForeignKey(related_name='+', blank=True, to='wagtailcore.Page', null=True)),
                ('page', modelcluster.fields.ParentalKey(related_name='carousel_items', to='events.EventPage')),
            ],
            options={
                'ordering': ['sort_order'],
                'abstract': False,
            },
        ),
        migrations.CreateModel(
            name='EventPageRelatedLink',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('sort_order', models.IntegerField(null=True, editable=False, blank=True)),
                ('link_external', models.URLField(verbose_name=b'External link', blank=True)),

fields=[
                ('page_ptr', models.OneToOneField(auto_created=True, parent_link=True, primary_key=True, to='wagtailcore.Page', serialize=False)),
            ],
            options={
                'abstract': False,
            },
            bases=('wagtailcore.page',),
        ),
        migrations.AlterModelOptions(
            name='homepage',
            options={'verbose_name': 'Homepage'},
        ),
        migrations.AddField(
            model_name='homepage',
            name='body_da',
            field=wagtail.wagtailcore.fields.StreamField((('heading', wagtail.wagtailcore.blocks.CharBlock(classname='full title', icon='title')), ('paragraph', wagtail.wagtailcore.blocks.TextBlock(icon='pilcrow')), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(icon='image')), ('info_block', wagtail.wagtailcore.blocks.StructBlock((('background_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='none')), ('font_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='black')), ('heading', wagtail.wagtailcore.blocks.TextBlock()), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(required=False)), ('embedded_video', wagtail.wagtailembeds.blocks.EmbedBlock(required=False)), ('text', wagtail.wagtailcore.blocks.TextBlock()), ('internal_link', wagtail.wagtailcore.blocks.URLBlock(required=False)))))), blank=True, null=True),
        ),
        migrations.AddField(
            model_name='homepage',
            name='body_de',
            field=wagtail.wagtailcore.fields.StreamField((('heading', wagtail.wagtailcore.blocks.CharBlock(classname='full title', icon='title')), ('paragraph', wagtail.wagtailcore.blocks.TextBlock(icon='pilcrow')), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(icon='image')), ('info_block', wagtail.wagtailcore.blocks.StructBlock((('background_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='none')), ('font_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='black')), ('heading', wagtail.wagtailcore.blocks.TextBlock()), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(required=False)), ('embedded_video', wagtail.wagtailembeds.blocks.EmbedBlock(required=False)), ('text', wagtail.wagtailcore.blocks.TextBlock()), ('internal_link', wagtail.wagtailcore.blocks.URLBlock(required=False)))))), blank=True, null=True),
        ),
        migrations.AddField(
            model_name='homepage',
            name='body_en',
            field=wagtail.wagtailcore.fields.StreamField((('heading', wagtail.wagtailcore.blocks.CharBlock(classname='full title', icon='title')), ('paragraph', wagtail.wagtailcore.blocks.TextBlock(icon='pilcrow')), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(icon='image')), ('info_block', wagtail.wagtailcore.blocks.StructBlock((('background_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='none')), ('font_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='black')), ('heading', wagtail.wagtailcore.blocks.TextBlock()), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(required=False)), ('embedded_video', wagtail.wagtailembeds.blocks.EmbedBlock(required=False)), ('text', wagtail.wagtailcore.blocks.TextBlock()), ('internal_link', wagtail.wagtailcore.blocks.URLBlock(required=False)))))), null=True),
        ),
        migrations.AddField(
            model_name='homepage',
            name='body_fr',
            field=wagtail.wagtailcore.fields.StreamField((('heading', wagtail.wagtailcore.blocks.CharBlock(classname='full title', icon='title')), ('paragraph', wagtail.wagtailcore.blocks.TextBlock(icon='pilcrow')), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(icon='image')), ('info_block', wagtail.wagtailcore.blocks.StructBlock((('background_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='none')), ('font_colour', wagtail.wagtailcore.blocks.ChoiceBlock(choices=[('none', 'none'), ('inverse', 'inverse'), ('danger', 'danger')], default='black')), ('heading', wagtail.wagtailcore.blocks.TextBlock()), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(required=False)), ('embedded_video', wagtail.wagtailembeds.blocks.EmbedBlock(required=False)), ('text', wagtail.wagtailcore.blocks.TextBlock()), ('internal_link', wagtail.wagtailcore.blocks.URLBlock(required=False)))))), blank=True, null=True),
        ),

import wagtail.wagtailcore.fields
import wagtail.wagtailcore.blocks


class Migration(migrations.Migration):

    dependencies = [
        ('wagtailimages', '0013_make_rendition_upload_callable'),
        ('catalogue', '0010_auto_20160616_1048'),
    ]

    operations = [
        migrations.AddField(
            model_name='category',
            name='body',
            field=wagtail.wagtailcore.fields.StreamField([(b'heading', wagtail.wagtailcore.blocks.CharBlock(classname=b'full title')), (b'paragraph', wagtail.wagtailcore.blocks.RichTextBlock()), (b'image', wagtail.wagtailimages.blocks.ImageChooserBlock()), (b'product_block', wagtail.wagtailcore.blocks.StructBlock([(b'title', wagtail.wagtailcore.blocks.CharBlock()), (b'subtitle', wagtail.wagtailcore.blocks.CharBlock()), (b'products', wagtail.wagtailcore.blocks.ListBlock(demo.apps.catalogue.blocks.ProductChooserBlock))]))], default=''),
            preserve_default=False,
        ),
        migrations.AddField(
            model_name='category',
            name='description',
            field=models.TextField(verbose_name='Description', blank=True),
        ),
        migrations.AddField(
            model_name='category',
            name='image',
            field=models.ForeignKey(related_name='+', on_delete=django.db.models.deletion.SET_NULL, blank=True, to='wagtailimages.Image', null=True),
        ),
        migrations.AlterField(
            model_name='category',
            name='name',
            field=models.CharField(max_length=255, verbose_name='Name', db_index=True),

import wagtail.wagtailcore.fields


class Migration(migrations.Migration):

    dependencies = [
        ('wagtailcore', '0040_page_draft_title'),
        ('takwimu', '0035_socialmediasetting_linkedin'),
    ]

    operations = [
        migrations.CreateModel(
            name='FAQSetting',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('faqs', wagtail.wagtailcore.fields.StreamField([(b'faq', wagtail.wagtailcore.blocks.StructBlock([(b'question', wagtail.wagtailcore.blocks.CharBlock(required=True)), (b'answer', wagtail.wagtailcore.blocks.RichTextBlock(required=True)), (b'cta_one_url', wagtail.wagtailcore.blocks.URLBlock(default=b'https://takwimu.zendesk.com/', label=b"'Find Out More' Button URL")), (b'cta_two_name', wagtail.wagtailcore.blocks.CharBlock(label=b'Second Button Name (Optional)', required=False)), (b'cta_two_url', wagtail.wagtailcore.blocks.URLBlock(label=b'Second Button URL (Optional)', required=False))]))], blank=True)),
                ('site', models.OneToOneField(editable=False, on_delete=django.db.models.deletion.CASCADE, to='wagtailcore.Site')),
            ],
            options={
                'verbose_name': 'FAQ',
            },

def transformation_for_foreign_key(field_object):

    related_model = field_object.rel.to

    if related_model == wagtail.wagtailimages.models.Image:
        return image_for_name
    if related_model == wagtail.wagtailcore.fields.RichTextField:
        return to_markdown
    if related_model == wagtail.wagtailcore.models.Page:
        return page_for_path
    else:
        return model_by_natural_key(related_model)

dependencies = [
        ('wagtailimages', '0006_add_verbose_names'),
        ('wagtaildocs', '0003_add_verbose_names'),
        ('wagtailcore', '0001_squashed_0016_change_page_url_path_to_text_field'),
    ]

    operations = [
        migrations.CreateModel(
            name='ContentBlock',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('link_external', models.URLField(verbose_name=b'External link', blank=True)),
                ('title', models.CharField(max_length=255)),
                ('body', wagtail.wagtailcore.fields.RichTextField()),
                ('summary', wagtail.wagtailcore.fields.RichTextField(blank=True)),
                ('slug', models.SlugField()),
                ('link_document', models.ForeignKey(related_name='+', blank=True, to='wagtaildocs.Document', null=True)),
            ],
            options={
                'abstract': False,
            },
        ),
        migrations.CreateModel(
            name='FaqsPage',
            fields=[
                ('page_ptr', models.OneToOneField(parent_link=True, auto_created=True, primary_key=True, serialize=False, to='wagtailcore.Page')),
                ('body', wagtail.wagtailcore.fields.StreamField([(b'faq_question', wagtail.wagtailcore.blocks.CharBlock(classname=b'full title')), (b'faq_answer', wagtail.wagtailcore.blocks.RichTextBlock())])),
            ],
            options={
                'abstract': False,
            },

class Migration(migrations.Migration):

    dependencies = [
        ('wagtailimages', '0006_add_verbose_names'),
        ('wagtaildocs', '0003_add_verbose_names'),
        ('wagtailcore', '0001_squashed_0016_change_page_url_path_to_text_field'),
    ]

    operations = [
        migrations.CreateModel(
            name='ContentBlock',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('link_external', models.URLField(verbose_name=b'External link', blank=True)),
                ('title', models.CharField(max_length=255)),
                ('body', wagtail.wagtailcore.fields.RichTextField()),
                ('summary', wagtail.wagtailcore.fields.RichTextField(blank=True)),
                ('slug', models.SlugField()),
                ('link_document', models.ForeignKey(related_name='+', blank=True, to='wagtaildocs.Document', null=True)),
            ],
            options={
                'abstract': False,
            },
        ),
        migrations.CreateModel(
            name='FaqsPage',
            fields=[
                ('page_ptr', models.OneToOneField(parent_link=True, auto_created=True, primary_key=True, serialize=False, to='wagtailcore.Page')),
                ('body', wagtail.wagtailcore.fields.StreamField([(b'faq_question', wagtail.wagtailcore.blocks.CharBlock(classname=b'full title')), (b'faq_answer', wagtail.wagtailcore.blocks.RichTextBlock())])),
            ],
            options={
                'abstract': False,

},
        ),
        migrations.CreateModel(
            name='PersonPage',
            fields=[
                ('page_ptr', models.OneToOneField(parent_link=True, auto_created=True, primary_key=True, serialize=False, to='wagtailcore.Page')),
                ('name_organization', models.CharField(max_length=255, blank=True)),
                ('telephone', models.CharField(max_length=20, blank=True)),
                ('email', models.EmailField(max_length=254, blank=True)),
                ('address_1', models.CharField(max_length=255, blank=True)),
                ('address_2', models.CharField(max_length=255, blank=True)),
                ('city', models.CharField(max_length=255, blank=True)),
                ('country', models.CharField(max_length=255, blank=True)),
                ('post_code', models.CharField(max_length=10, blank=True)),
                ('intro', wagtail.wagtailcore.fields.RichTextField(blank=True)),
                ('biography', wagtail.wagtailcore.fields.RichTextField(blank=True)),
                ('feed_image', models.ForeignKey(related_name='+', on_delete=django.db.models.deletion.SET_NULL, blank=True, to='wagtailimages.Image', null=True)),
                ('image', models.ForeignKey(related_name='+', on_delete=django.db.models.deletion.SET_NULL, blank=True, to='wagtailimages.Image', null=True)),
            ],
            options={
                'abstract': False,
            },
            bases=('wagtailcore.page', models.Model),
        ),
        migrations.CreateModel(
            name='PersonPageRelatedLink',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('sort_order', models.IntegerField(null=True, editable=False, blank=True)),
                ('link_external', models.URLField(verbose_name=b'External link', blank=True)),
                ('title', models.CharField(help_text=b'Link title', max_length=255)),
                ('link_document', models.ForeignKey(related_name='+', blank=True, to='wagtaildocs.Document', null=True)),

import wagtail.wagtailcore.blocks
import wagtail.wagtailcore.fields
import wagtail.wagtailimages.blocks


class Migration(migrations.Migration):

    dependencies = [
        ('torchbox', '0088_fix_wrong_parameter_in_page_chooser_block'),
    ]

    operations = [
        migrations.AlterField(
            model_name='servicepage',
            name='streamfield',
            field=wagtail.wagtailcore.fields.StreamField([(b'case_studies', wagtail.wagtailcore.blocks.StructBlock([(b'title', wagtail.wagtailcore.blocks.CharBlock(required=True)), (b'intro', wagtail.wagtailcore.blocks.TextBlock(required=True)), (b'case_studies', wagtail.wagtailcore.blocks.ListBlock(wagtail.wagtailcore.blocks.StructBlock([('page', wagtail.wagtailcore.blocks.PageChooserBlock('torchbox.WorkPage')), ('title', wagtail.wagtailcore.blocks.CharBlock(required=False)), ('descriptive_title', wagtail.wagtailcore.blocks.CharBlock(required=False)), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock(required=False))])))])), (b'highlights', wagtail.wagtailcore.blocks.StructBlock([(b'title', wagtail.wagtailcore.blocks.CharBlock(required=True)), (b'intro', wagtail.wagtailcore.blocks.TextBlock(required=False)), (b'highlights', wagtail.wagtailcore.blocks.ListBlock(wagtail.wagtailcore.blocks.TextBlock()))])), (b'pull_quote', wagtail.wagtailcore.blocks.StructBlock([(b'quote', wagtail.wagtailcore.blocks.CharBlock(classname='quote title')), (b'attribution', wagtail.wagtailcore.blocks.CharBlock())], template='blocks/pull_quote_block.html')), (b'process', wagtail.wagtailcore.blocks.StructBlock([(b'title', wagtail.wagtailcore.blocks.CharBlock(required=True)), (b'intro', wagtail.wagtailcore.blocks.TextBlock(required=False)), (b'steps', wagtail.wagtailcore.blocks.ListBlock(wagtail.wagtailcore.blocks.StructBlock([('subtitle', wagtail.wagtailcore.blocks.CharBlock(required=False)), ('title', wagtail.wagtailcore.blocks.CharBlock(required=True)), ('icon', wagtail.wagtailcore.blocks.CharBlock(help_text='Paste SVG code here', max_length=9000, required=True)), ('description', wagtail.wagtailcore.blocks.TextBlock(required=True))])))])), (b'people', wagtail.wagtailcore.blocks.StructBlock([(b'title', wagtail.wagtailcore.blocks.CharBlock(required=True)), (b'intro', wagtail.wagtailcore.blocks.TextBlock(required=True)), (b'people', wagtail.wagtailcore.blocks.ListBlock(wagtail.wagtailcore.blocks.PageChooserBlock()))])), (b'featured_pages', wagtail.wagtailcore.blocks.StructBlock([(b'title', wagtail.wagtailcore.blocks.CharBlock()), (b'pages', wagtail.wagtailcore.blocks.ListBlock(wagtail.wagtailcore.blocks.StructBlock([('page', wagtail.wagtailcore.blocks.PageChooserBlock()), ('image', wagtail.wagtailimages.blocks.ImageChooserBlock()), ('text', wagtail.wagtailcore.blocks.TextBlock()), ('sub_text', wagtail.wagtailcore.blocks.CharBlock(max_length=100))])))]))]),
        ),