Feature/mutil embedding model (#908)

Co-authored-by: JzoNg <jzongcode@gmail.com>
Co-authored-by: jyong <jyong@dify.ai>
Co-authored-by: StyleZhang <jasonapring2015@outlook.com>

api/migrations/versions/e8883b0148c9_add_dataset_model_name.py

@@ -0,0 +1,34 @@
+"""add_dataset_model_name
+
+Revision ID: e8883b0148c9
+Revises: 2c8af9671032
+Create Date: 2023-08-15 20:54:58.936787
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'e8883b0148c9'
+down_revision = '2c8af9671032'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('datasets', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('embedding_model', sa.String(length=255), server_default=sa.text("'text-embedding-ada-002'::character varying"), nullable=False))
+        batch_op.add_column(sa.Column('embedding_model_provider', sa.String(length=255), server_default=sa.text("'openai'::character varying"), nullable=False))
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('datasets', schema=None) as batch_op:
+        batch_op.drop_column('embedding_model_provider')
+        batch_op.drop_column('embedding_model')
+
+    # ### end Alembic commands ###