[CHG] *: make binary fields default to attachment=True

Check that it makes custom binary fields into attachment as that's the
main reason for the change: when users create binary fields via Studio,
they're necessarily db-stored (as the interface doesn't allow altering
the attachment attribute and it's unclear how we'd handle users
switching it on/off every time), which significantly bloats their
database (and burns storage & backup space), especially as the primary
use case for binary fields is adding images and documents to records.

* check that binary fields are properly created as attachment=True
* add attachment=False on fields where that seems relevant (most but not
  all of the fields previously using the default)
* remove occurrences of attachment=True

closes odoo/odoo#29308

29 files changed, 61 insertions, 55 deletions

diff --git a/addons/account_bank_statement_import/account_bank_statement_import.py b/addons/account_bank_statement_import/account_bank_statement_import.py
index 6fb102104c5..652080c8416 100644
--- a/addons/account_bank_statement_import/account_bank_statement_import.py
+++ b/addons/account_bank_statement_import/account_bank_statement_import.py
@@ -25,7 +25,7 @@ class AccountBankStatementImport(models.TransientModel):
     _name = 'account.bank.statement.import'
     _description = 'Import Bank Statement'
 
-    data_file = fields.Binary(string='Bank Statement File', required=True, help='Get you bank statements in electronic format from your bank and select them here.')
+    data_file = fields.Binary(string='Bank Statement File', attachment=False, required=True, help='Get you bank statements in electronic format from your bank and select them here.')
     filename = fields.Char()
 
     @api.multi
diff --git a/addons/base_import/models/base_import.py b/addons/base_import/models/base_import.py
index 5e75af21f91..ff44294e40b 100644
--- a/addons/base_import/models/base_import.py
+++ b/addons/base_import/models/base_import.py
@@ -113,7 +113,7 @@ class Import(models.TransientModel):
     _transient_max_hours = 12.0
 
     res_model = fields.Char('Model')
-    file = fields.Binary('File', help="File to check and/or import, raw binary (not base64)")
+    file = fields.Binary('File', help="File to check and/or import, raw binary (not base64)", attachment=False)
     file_name = fields.Char('File Name')
     file_type = fields.Char('File Type')
 
diff --git a/addons/base_import_module/models/base_import_module.py b/addons/base_import_module/models/base_import_module.py
index b678a4fe0f0..9a855384052 100644
--- a/addons/base_import_module/models/base_import_module.py
+++ b/addons/base_import_module/models/base_import_module.py
@@ -9,7 +9,7 @@ class BaseImportModule(models.TransientModel):
     _name = "base.import.module"
     _description = "Import Module"
 
-    module_file = fields.Binary(string='Module .ZIP file', required=True)
+    module_file = fields.Binary(string='Module .ZIP file', required=True, attachment=False)
     state = fields.Selection([('init', 'init'), ('done', 'done')], string='Status', readonly=True, default='init')
     import_message = fields.Char()
     force = fields.Boolean(string='Force init', help="Force init mode even if installed. (will update `noupdate='1'` records)")
diff --git a/addons/fleet/models/fleet_vehicle_model.py b/addons/fleet/models/fleet_vehicle_model.py
index ded926fc2a0..18dea8f0a95 100644
--- a/addons/fleet/models/fleet_vehicle_model.py
+++ b/addons/fleet/models/fleet_vehicle_model.py
@@ -41,13 +41,13 @@ class FleetVehicleModelBrand(models.Model):
     _order = 'name asc'
 
     name = fields.Char('Make', required=True)
-    image = fields.Binary("Logo", attachment=True,
+    image = fields.Binary("Logo",
         help="This field holds the image used as logo for the brand, limited to 1024x1024px.")
-    image_medium = fields.Binary("Medium-sized image", attachment=True,
+    image_medium = fields.Binary("Medium-sized image",
         help="Medium-sized logo of the brand. It is automatically "
              "resized as a 128x128px image, with aspect ratio preserved. "
              "Use this field in form views or some kanban views.")
-    image_small = fields.Binary("Small-sized image", attachment=True,
+    image_small = fields.Binary("Small-sized image",
         help="Small-sized logo of the brand. It is automatically "
              "resized as a 64x64px image, with aspect ratio preserved. "
              "Use this field anywhere a small image is required.")
diff --git a/addons/gamification/models/badge.py b/addons/gamification/models/badge.py
index 6686b29fee5..cf750aaa5f2 100644
--- a/addons/gamification/models/badge.py
+++ b/addons/gamification/models/badge.py
@@ -66,7 +66,7 @@ class GamificationBadge(models.Model):
     name = fields.Char('Badge', required=True, translate=True)
     active = fields.Boolean('Active', default=True)
     description = fields.Text('Description', translate=True)
-    image = fields.Binary("Image", attachment=True, help="This field holds the image used for the badge, limited to 256x256")
+    image = fields.Binary("Image", help="This field holds the image used for the badge, limited to 256x256")
 
     rule_auth = fields.Selection([
             ('everyone', 'Everyone'),
diff --git a/addons/hr/models/hr.py b/addons/hr/models/hr.py
index 27fd8ae6962..353920a9695 100644
--- a/addons/hr/models/hr.py
+++ b/addons/hr/models/hr.py
@@ -168,15 +168,15 @@ class Employee(models.Model):
 
     # image: all image fields are base64 encoded and PIL-supported
     image = fields.Binary(
-        "Photo", default=_default_image, attachment=True,
+        "Photo", default=_default_image,
         help="This field holds the image used as photo for the employee, limited to 1024x1024px.")
     image_medium = fields.Binary(
-        "Medium-sized photo", attachment=True,
+        "Medium-sized photo",
         help="Medium-sized photo of the employee. It is automatically "
              "resized as a 128x128px image, with aspect ratio preserved. "
              "Use this field in form views or some kanban views.")
     image_small = fields.Binary(
-        "Small-sized photo", attachment=True,
+        "Small-sized photo",
         help="Small-sized photo of the employee. It is automatically "
              "resized as a 64x64px image, with aspect ratio preserved. "
              "Use this field anywhere a small image is required.")
diff --git a/addons/im_livechat/models/im_livechat_channel.py b/addons/im_livechat/models/im_livechat_channel.py
index a5c187a1067..e0aefadecb1 100644
--- a/addons/im_livechat/models/im_livechat_channel.py
+++ b/addons/im_livechat/models/im_livechat_channel.py
@@ -43,13 +43,13 @@ class ImLivechatChannel(models.Model):
     nbr_channel = fields.Integer('Number of conversation', compute='_compute_nbr_channel', store=False, readonly=True)
 
     # images fields
-    image = fields.Binary('Image', default=_default_image, attachment=True,
+    image = fields.Binary('Image', default=_default_image,
         help="This field holds the image used as photo for the group, limited to 1024x1024px.")
-    image_medium = fields.Binary('Medium', attachment=True,
+    image_medium = fields.Binary('Medium',
         help="Medium-sized photo of the group. It is automatically "\
              "resized as a 128x128px image, with aspect ratio preserved. "\
              "Use this field in form views or some kanban views.")
-    image_small = fields.Binary('Thumbnail', attachment=True,
+    image_small = fields.Binary('Thumbnail',
         help="Small-sized photo of the group. It is automatically "\
              "resized as a 64x64px image, with aspect ratio preserved. "\
              "Use this field anywhere a small image is required.")
diff --git a/addons/l10n_fr_fec/wizard/account_fr_fec.py b/addons/l10n_fr_fec/wizard/account_fr_fec.py
index be79824967a..bf18ff184ad 100644
--- a/addons/l10n_fr_fec/wizard/account_fr_fec.py
+++ b/addons/l10n_fr_fec/wizard/account_fr_fec.py
@@ -17,7 +17,7 @@ class AccountFrFec(models.TransientModel):
 
     date_from = fields.Date(string='Start Date', required=True)
     date_to = fields.Date(string='End Date', required=True)
-    fec_data = fields.Binary('FEC File', readonly=True)
+    fec_data = fields.Binary('FEC File', readonly=True, attachment=False)
     filename = fields.Char(string='Filename', size=256, readonly=True)
     export_type = fields.Selection([
         ('official', 'Official FEC report (posted entries only)'),
diff --git a/addons/lunch/models/lunch_product.py b/addons/lunch/models/lunch_product.py
index af3d25df7d7..b9334aba260 100644
--- a/addons/lunch/models/lunch_product.py
+++ b/addons/lunch/models/lunch_product.py
@@ -61,15 +61,15 @@ class LunchProduct(models.Model):
 
     # image: all image fields are base64 encoded and PIL-supported
     image = fields.Binary(
-        "Image", attachment=True,
+        "Image",
         help="This field holds the image used as image for the product, limited to 1024x1024px.")
     image_medium = fields.Binary(
-        "Medium-sized image", attachment=True,
+        "Medium-sized image",
         help="Medium-sized image of the product. It is automatically "
              "resized as a 128x128px image, with aspect ratio preserved, "
              "only when the image exceeds one of those sizes. Use this field in form views or some kanban views.")
     image_small = fields.Binary(
-        "Small-sized image", attachment=True,
+        "Small-sized image",
         help="Small-sized image of the product. It is automatically "
              "resized as a 64x64px image, with aspect ratio preserved. "
              "Use this field anywhere a small image is required.")
diff --git a/addons/mail/models/mail_channel.py b/addons/mail/models/mail_channel.py
index f7384a87b8f..71e42eee3ff 100644
--- a/addons/mail/models/mail_channel.py
+++ b/addons/mail/models/mail_channel.py
@@ -101,13 +101,13 @@ class Channel(models.Model):
              "Note that they will be able to manage their subscription manually "
              "if necessary.")
     # image: all image fields are base64 encoded and PIL-supported
-    image = fields.Binary("Photo", default=_get_default_image, attachment=True,
+    image = fields.Binary("Photo", default=_get_default_image,
         help="This field holds the image used as photo for the group, limited to 1024x1024px.")
-    image_medium = fields.Binary('Medium-sized photo', attachment=True,
+    image_medium = fields.Binary('Medium-sized photo',
         help="Medium-sized photo of the group. It is automatically "
              "resized as a 128x128px image, with aspect ratio preserved. "
              "Use this field in form views or some kanban views.")
-    image_small = fields.Binary('Small-sized photo', attachment=True,
+    image_small = fields.Binary('Small-sized photo',
         help="Small-sized photo of the group. It is automatically "
              "resized as a 64x64px image, with aspect ratio preserved. "
              "Use this field anywhere a small image is required.")
diff --git a/addons/payment/models/payment_acquirer.py b/addons/payment/models/payment_acquirer.py
index 90d9177ff58..6918f80584f 100644
--- a/addons/payment/models/payment_acquirer.py
+++ b/addons/payment/models/payment_acquirer.py
@@ -150,15 +150,14 @@ class PaymentAcquirer(models.Model):
     module_state = fields.Selection(selection=ir_module.STATES, string='Installation State', related='module_id.state', readonly=False)
 
     image = fields.Binary(
-        "Image", attachment=True,
-        help="This field holds the image used for this provider, limited to 1024x1024px")
+        "Image", help="This field holds the image used for this provider, limited to 1024x1024px")
     image_medium = fields.Binary(
-        "Medium-sized image", attachment=True,
+        "Medium-sized image",
         help="Medium-sized image of this provider. It is automatically "
              "resized as a 128x128px image, with aspect ratio preserved. "
              "Use this field in form views or some kanban views.")
     image_small = fields.Binary(
-        "Small-sized image", attachment=True,
+        "Small-sized image",
         help="Small-sized image of this provider. It is automatically "
              "resized as a 64x64px image, with aspect ratio preserved. "
              "Use this field anywhere a small image is required.")
@@ -502,8 +501,7 @@ class PaymentIcon(models.Model):
     name = fields.Char(string='Name')
     acquirer_ids = fields.Many2many('payment.acquirer', string="Acquirers", help="List of Acquirers supporting this payment icon.")
     image = fields.Binary(
-        "Image", attachment=True,
-        help="This field holds the image used for this payment icon, limited to 1024x1024px")
+        "Image", help="This field holds the image used for this payment icon, limited to 1024x1024px")
 
     image_payment_form = fields.Binary(
         "Image displayed on the payment form", attachment=True)
diff --git a/addons/point_of_sale/models/pos_category.py b/addons/point_of_sale/models/pos_category.py
index c5741486794..8b7d69f43ff 100644
--- a/addons/point_of_sale/models/pos_category.py
+++ b/addons/point_of_sale/models/pos_category.py
@@ -20,13 +20,13 @@ class PosCategory(models.Model):
     # thumbnails for categories. However if we have a thumbnail for at least one
     # category, then we display a default image on the other, so that the
     # buttons have consistent styling.
-    image = fields.Binary(attachment=True,
+    image = fields.Binary(
         help="This field holds the image used as image for the cateogry, limited to 1024x1024px.")
-    image_medium = fields.Binary(string="Medium-sized image", attachment=True,
+    image_medium = fields.Binary(string="Medium-sized image",
         help="Medium-sized image of the category. It is automatically "
              "resized as a 128x128px image, with aspect ratio preserved. "
              "Use this field in form views or some kanban views.")
-    image_small = fields.Binary(string="Small-sized image", attachment=True,
+    image_small = fields.Binary(string="Small-sized image",
         help="Small-sized image of the category. It is automatically "
              "resized as a 64x64px image, with aspect ratio preserved. "
              "Use this field anywhere a small image is required.")
diff --git a/addons/pos_restaurant/models/pos_restaurant.py b/addons/pos_restaurant/models/pos_restaurant.py
index 7530b774c6b..ea5c3a04d5b 100644
--- a/addons/pos_restaurant/models/pos_restaurant.py
+++ b/addons/pos_restaurant/models/pos_restaurant.py
@@ -11,7 +11,7 @@ class RestaurantFloor(models.Model):
 
     name = fields.Char('Floor Name', required=True, help='An internal identification of the restaurant floor')
     pos_config_id = fields.Many2one('pos.config', string='Point of Sale')
-    background_image = fields.Binary('Background Image', attachment=True, help='A background image used to display a floor layout in the point of sale interface')
+    background_image = fields.Binary('Background Image', help='A background image used to display a floor layout in the point of sale interface')
     background_color = fields.Char('Background Color', help='The background color of the floor layout, (must be specified in a html-compatible format)', default='rgb(210, 210, 210)')
     table_ids = fields.One2many('restaurant.table', 'floor_id', string='Tables', help='The list of tables in this floor')
     sequence = fields.Integer('Sequence', help='Used to sort Floors', default=1)
diff --git a/addons/product/models/product.py b/addons/product/models/product.py
index c9b31fa57dc..5cf5d37fff4 100644
--- a/addons/product/models/product.py
+++ b/addons/product/models/product.py
@@ -114,7 +114,7 @@ class ProductProduct(models.Model):
         'product.template.attribute.value', string='Template Attribute Values', compute="_compute_product_template_attribute_value_ids")
     # image: all image fields are base64 encoded and PIL-supported
     image_variant = fields.Binary(
-        "Variant Image", attachment=True,
+        "Variant Image",
         help="This field holds the image used as image for the product variant, limited to 1024x1024px.")
     image = fields.Binary(
         "Big-sized image", compute='_compute_images', inverse='_set_image',
diff --git a/addons/product/models/product_template.py b/addons/product/models/product_template.py
index 441c92da00f..4179cc19ffb 100644
--- a/addons/product/models/product_template.py
+++ b/addons/product/models/product_template.py
@@ -135,15 +135,14 @@ class ProductTemplate(models.Model):
 
     # image: all image fields are base64 encoded and PIL-supported
     image = fields.Binary(
-        "Image", attachment=True,
-        help="This field holds the image used as image for the product, limited to 1024x1024px.")
+        "Image", help="This field holds the image used as image for the product, limited to 1024x1024px.")
     image_medium = fields.Binary(
-        "Medium-sized image", attachment=True,
+        "Medium-sized image",
         help="Medium-sized image of the product. It is automatically "
              "resized as a 128x128px image, with aspect ratio preserved, "
              "only when the image exceeds one of those sizes. Use this field in form views or some kanban views.")
     image_small = fields.Binary(
-        "Small-sized image", attachment=True,
+        "Small-sized image",
         help="Small-sized image of the product. It is automatically "
              "resized as a 64x64px image, with aspect ratio preserved. "
              "Use this field anywhere a small image is required.")
diff --git a/addons/web_editor/models/test_models.py b/addons/web_editor/models/test_models.py
index f5eb7e86f64..d5ef48dc2af 100644
--- a/addons/web_editor/models/test_models.py
+++ b/addons/web_editor/models/test_models.py
@@ -16,7 +16,7 @@ class ConverterTest(models.Model):
     float = fields.Float()
     numeric = fields.Float(digits=(16, 2))
     many2one = fields.Many2one('web_editor.converter.test.sub')
-    binary = fields.Binary()
+    binary = fields.Binary(attachment=False)
     date = fields.Date()
     datetime = fields.Datetime()
     selection = fields.Selection([
diff --git a/addons/website/models/website.py b/addons/website/models/website.py
index 0a99b8ef8eb..682220e126a 100644
--- a/addons/website/models/website.py
+++ b/addons/website/models/website.py
@@ -86,7 +86,7 @@ class Website(models.Model):
     social_youtube = fields.Char('Youtube Account', default=_default_social_youtube)
     social_googleplus = fields.Char('Google+ Account', default=_default_social_googleplus)
     social_instagram = fields.Char('Instagram Account', default=_default_social_instagram)
-    social_default_image = fields.Binary(string="Default Social Share Image", attachment=True, help="If set, replaces the company logo as the default social share image.")
+    social_default_image = fields.Binary(string="Default Social Share Image", help="If set, replaces the company logo as the default social share image.")
 
     google_analytics_key = fields.Char('Google Analytics Key')
     google_management_client_id = fields.Char('Google Client ID')
diff --git a/addons/website_event_track/models/event_track.py b/addons/website_event_track/models/event_track.py
index 1c4758d50af..23df5bbac3e 100644
--- a/addons/website_event_track/models/event_track.py
+++ b/addons/website_event_track/models/event_track.py
@@ -88,7 +88,7 @@ class Track(models.Model):
         ('0', 'Low'), ('1', 'Medium'),
         ('2', 'High'), ('3', 'Highest')],
         'Priority', required=True, default='1')
-    image = fields.Binary('Image', related='partner_id.image_medium', store=True, attachment=True, readonly=False)
+    image = fields.Binary('Image', related='partner_id.image_medium', store=True, readonly=False)
 
     @api.multi
     @api.depends('name')
@@ -210,4 +210,4 @@ class Sponsor(models.Model):
     partner_id = fields.Many2one('res.partner', 'Sponsor/Customer', required=True)
     url = fields.Char('Sponsor Website')
     sequence = fields.Integer('Sequence', store=True, related='sponsor_type_id.sequence', readonly=False)
-    image_medium = fields.Binary(string='Logo', related='partner_id.image_medium', store=True, attachment=True, readonly=False)
+    image_medium = fields.Binary(string='Logo', related='partner_id.image_medium', store=True, readonly=False)
diff --git a/addons/website_sale/models/product.py b/addons/website_sale/models/product.py
index 06e9bc8595f..d9a2f9db452 100644
--- a/addons/website_sale/models/product.py
+++ b/addons/website_sale/models/product.py
@@ -66,13 +66,13 @@ class ProductPublicCategory(models.Model):
     # category, then we display a default image on the other, so that the
     # buttons have consistent styling.
     # In this case, the default image is set by the js code.
-    image = fields.Binary(attachment=True, help="This field holds the image used as image for the category, limited to 1024x1024px.")
+    image = fields.Binary(help="This field holds the image used as image for the category, limited to 1024x1024px.")
     website_description = fields.Html('Category Description', sanitize_attributes=False, translate=html_translate)
-    image_medium = fields.Binary(string='Medium-sized image', attachment=True,
+    image_medium = fields.Binary(string='Medium-sized image',
                                  help="Medium-sized image of the category. It is automatically "
                                  "resized as a 128x128px image, with aspect ratio preserved. "
                                  "Use this field in form views or some kanban views.")
-    image_small = fields.Binary(string='Small-sized image', attachment=True,
+    image_small = fields.Binary(string='Small-sized image',
                                 help="Small-sized image of the category. It is automatically "
                                 "resized as a 64x64px image, with aspect ratio preserved. "
                                 "Use this field anywhere a small image is required.")
diff --git a/odoo/addons/base/models/ir_actions.py b/odoo/addons/base/models/ir_actions.py
index 2b9f88104f1..814973aedc9 100644
--- a/odoo/addons/base/models/ir_actions.py
+++ b/odoo/addons/base/models/ir_actions.py
@@ -772,7 +772,7 @@ class IrActionsActClient(models.Model):
     params = fields.Binary(compute='_compute_params', inverse='_inverse_params', string='Supplementary arguments',
                            help="Arguments sent to the client along with "
                                 "the view tag")
-    params_store = fields.Binary(string='Params storage', readonly=True)
+    params_store = fields.Binary(string='Params storage', readonly=True, attachment=False)
 
     @api.depends('params_store')
     def _compute_params(self):
diff --git a/odoo/addons/base/models/ir_attachment.py b/odoo/addons/base/models/ir_attachment.py
index 967f93a33e2..942c5c906b2 100644
--- a/odoo/addons/base/models/ir_attachment.py
+++ b/odoo/addons/base/models/ir_attachment.py
@@ -294,7 +294,7 @@ class IrAttachment(models.Model):
 
     # the field 'datas' is computed and may use the other fields below
     datas = fields.Binary(string='File Content', compute='_compute_datas', inverse='_inverse_datas')
-    db_datas = fields.Binary('Database Data')
+    db_datas = fields.Binary('Database Data', attachment=False)
     store_fname = fields.Char('Stored Filename')
     file_size = fields.Integer('File Size', readonly=True)
     checksum = fields.Char("Checksum/SHA1", size=40, index=True, readonly=True)
diff --git a/odoo/addons/base/models/ir_property.py b/odoo/addons/base/models/ir_property.py
index 3360693d70d..0690080670f 100644
--- a/odoo/addons/base/models/ir_property.py
+++ b/odoo/addons/base/models/ir_property.py
@@ -42,7 +42,7 @@ class Property(models.Model):
     value_float = fields.Float()
     value_integer = fields.Integer()
     value_text = fields.Text()  # will contain (char, text)
-    value_binary = fields.Binary()
+    value_binary = fields.Binary(attachment=False)
     value_reference = fields.Char()
     value_datetime = fields.Datetime()
     type = fields.Selection([('char', 'Char'),
diff --git a/odoo/addons/base/models/res_company.py b/odoo/addons/base/models/res_company.py
index 64fb3ee6fb2..958b7a4edba 100644
--- a/odoo/addons/base/models/res_company.py
+++ b/odoo/addons/base/models/res_company.py
@@ -39,7 +39,7 @@ class Company(models.Model):
     logo = fields.Binary(related='partner_id.image', default=_get_logo, string="Company Logo", readonly=False)
     # logo_web: do not store in attachments, since the image is retrieved in SQL for
     # performance reasons (see addons/web/controllers/main.py, Binary.company_logo)
-    logo_web = fields.Binary(compute='_compute_logo_web', store=True)
+    logo_web = fields.Binary(compute='_compute_logo_web', store=True, attachment=False)
     currency_id = fields.Many2one('res.currency', string='Currency', required=True, default=lambda self: self._get_user_currency())
     user_ids = fields.Many2many('res.users', 'res_company_users_rel', 'cid', 'user_id', string='Accepted Users')
     account_no = fields.Char(string='Account No.')
diff --git a/odoo/addons/base/models/res_partner.py b/odoo/addons/base/models/res_partner.py
index f61dbbced38..5868209f38d 100644
--- a/odoo/addons/base/models/res_partner.py
+++ b/odoo/addons/base/models/res_partner.py
@@ -222,13 +222,13 @@ class Partner(models.Model):
     company_name = fields.Char('Company Name')
 
     # image: all image fields are base64 encoded and PIL-supported
-    image = fields.Binary("Image", attachment=True,
+    image = fields.Binary("Image",
         help="This field holds the image used as avatar for this contact, limited to 1024x1024px",)
-    image_medium = fields.Binary("Medium-sized image", attachment=True,
+    image_medium = fields.Binary("Medium-sized image",
         help="Medium-sized image of this contact. It is automatically "\
              "resized as a 128x128px image, with aspect ratio preserved. "\
              "Use this field in form views or some kanban views.")
-    image_small = fields.Binary("Small-sized image", attachment=True,
+    image_small = fields.Binary("Small-sized image",
         help="Small-sized image of this contact. It is automatically "\
              "resized as a 64x64px image, with aspect ratio preserved. "\
              "Use this field anywhere a small image is required.")
diff --git a/odoo/addons/base/tests/test_ir_actions.py b/odoo/addons/base/tests/test_ir_actions.py
index 865cca5e43a..9eb47d569da 100644
--- a/odoo/addons/base/tests/test_ir_actions.py
+++ b/odoo/addons/base/tests/test_ir_actions.py
@@ -246,14 +246,14 @@ class TestCustomFields(common.TransactionCase):
         self.registry.enter_test_mode(self.cr)
         self.addCleanup(self.registry.leave_test_mode)
 
-    def create_field(self, name):
+    def create_field(self, name, *, field_type='char'):
         """ create a custom field and return it """
         model = self.env['ir.model'].search([('model', '=', self.MODEL)])
         field = self.env['ir.model.fields'].create({
             'model_id': model.id,
             'name': name,
             'field_description': name,
-            'ttype': 'char',
+            'ttype': field_type,
         })
         self.assertIn(name, self.env[self.MODEL]._fields)
         return field
@@ -385,3 +385,12 @@ class TestCustomFields(common.TransactionCase):
         # uninstall mode: unlink dependant fields
         field.with_context(_force_unlink=True).unlink()
         self.assertFalse(dependant.exists())
+
+    def test_create_binary(self):
+        """ binary custom fields should be created as attachment=True to avoid
+        bloating the DB when creating e.g. image fields via studio
+        """
+        self.create_field('x_image', field_type='binary')
+        custom_binary = self.env[self.MODEL]._fields['x_image']
+
+        self.assertTrue(custom_binary.attachment)
diff --git a/odoo/addons/base/wizard/base_export_language.py b/odoo/addons/base/wizard/base_export_language.py
index 4695c250603..e8147c8954e 100644
--- a/odoo/addons/base/wizard/base_export_language.py
+++ b/odoo/addons/base/wizard/base_export_language.py
@@ -25,7 +25,7 @@ class BaseLanguageExport(models.TransientModel):
                               string='File Format', required=True, default='csv')
     modules = fields.Many2many('ir.module.module', 'rel_modules_langexport', 'wiz_id', 'module_id',
                                string='Apps To Export', domain=[('state','=','installed')])
-    data = fields.Binary('File', readonly=True)
+    data = fields.Binary('File', readonly=True, attachment=False)
     state = fields.Selection([('choose', 'choose'), ('get', 'get')], # choose language or get the file
                              default='choose')
 
diff --git a/odoo/addons/base/wizard/base_import_language.py b/odoo/addons/base/wizard/base_import_language.py
index aea906b8dc9..1017806119e 100644
--- a/odoo/addons/base/wizard/base_import_language.py
+++ b/odoo/addons/base/wizard/base_import_language.py
@@ -19,7 +19,7 @@ class BaseLanguageImport(models.TransientModel):
     name = fields.Char('Language Name', required=True)
     code = fields.Char('ISO Code', size=5, required=True,
                        help="ISO Language and Country code, e.g. en_US")
-    data = fields.Binary('File', required=True)
+    data = fields.Binary('File', required=True, attachment=False)
     filename = fields.Char('File Name', required=True)
     overwrite = fields.Boolean('Overwrite Existing Terms',
                                help="If you enable this option, existing translations (including custom ones) "
diff --git a/odoo/addons/test_converter/models.py b/odoo/addons/test_converter/models.py
index 49fc86cbb07..29a8bcefebf 100644
--- a/odoo/addons/test_converter/models.py
+++ b/odoo/addons/test_converter/models.py
@@ -12,7 +12,7 @@ class test_model(models.Model):
     float = fields.Float()
     numeric = fields.Float(digits=(16, 2))
     many2one = fields.Many2one('test_converter.test_model.sub', group_expand='_gbf_m2o')
-    binary = fields.Binary()
+    binary = fields.Binary(attachment=False)
     date = fields.Date()
     datetime = fields.Datetime()
     selection = fields.Selection([
diff --git a/odoo/fields.py b/odoo/fields.py
index a69edde187d..014f658f3b9 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -1742,7 +1742,7 @@ class Binary(Field):
     _slots = {
         'prefetch': False,              # not prefetched by default
         'context_dependent': True,      # depends on context (content or size)
-        'attachment': False,            # whether value is stored in attachment
+        'attachment': True,             # whether value is stored in attachment
     }
 
     @property