Switch Text to LongText for MySQL manifests

data/migrations/versions/35f538da62_switch_manifest_text_to_a_longtext.py

@@ -0,0 +1,47 @@
+"""Switch manifest text to a longtext.
+
+Revision ID: 35f538da62
+Revises: 33bd39ef5ed6
+Create Date: 2015-10-23 15:31:27.353995
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '35f538da62'
+down_revision = '33bd39ef5ed6'
+
+from alembic import op
+import sqlalchemy as sa
+
+from sqlalchemy.types import TypeDecorator, Text
+from sqlalchemy.dialects.mysql import LONGTEXT
+import uuid
+
+class EngineLongText(TypeDecorator):
+    """Platform-independent LongText type.
+
+    Uses MySQL's LONGTEXT type, otherwise uses
+    Text, because other engines are not as limited
+    as MySQL.
+
+    """
+    impl = Text
+
+    def load_dialect_impl(self, dialect):
+        if dialect.name == 'mysql':
+            return dialect.type_descriptor(LONGTEXT())
+        else:
+            return dialect.type_descriptor(Text())
+
+def upgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column(u'tagmanifest', 'json_data')
+    op.add_column(u'tagmanifest', sa.Column('json_data', EngineLongText(), nullable=False))
+    ### end Alembic commands ###
+
+
+def downgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column(u'tagmanifest', 'json_data')
+    op.add_column(u'tagmanifest', sa.Column('json_data', sa.Text(), nullable=False))
+    ### end Alembic commands ###