What is the question?
On Saturday, 5 December 2015 10:11:04 UTC-6, Eliot Simcoe wrote:
>
> Hello World,
>
> I have a table named File is supposed to be referenced by other tables in
> an attempt to simulate the "upload' field type. This table is coupled with
> a Folder table and simulates a file system in the database.
>
> File Fields:
> Field('name', 'string', label=T("Name"), requires=IS_NOT_EMPTY(), required
> =True, notnull=True, length=255),
> Field('caption', 'text', label=T("Caption")),
> Field('content_type', 'string', label=T("Content Type"), requires=
> IS_NOT_EMPTY(), required=True, notnull=True, length=255),
> Field('data_storage', 'upload', label=T("Storage"), uploadfolder=cls.
> __UPLOAD_FOLDER__, uploadseparate=True, autodelete=True, required=True,
> notnull=True),
> Field('folder_id', cls.__PARENT_CLASS__.Reference(), label=T("Folder"),
> ondelete='CASCADE'),
> Field('order_hint', 'integer', label=T("Order")),
> Field('absolute_path', compute=lambda row: absolute_path_from_storage(row.
> data_storage, cls.__UPLOAD_FOLDER__))
>
> I have built an ORM around pydal, so the code looks a little funny - but
> this problem relates directly to web2py.
>
> Now, I have another table that references this file table. This is fine
> and works well with Smart Grid as long as you are only using file(s) that
> are already in the database. Smart grid provides the usual popup button on
> an html page and you can choose which file you want to reference.
>
> Here is an example field set from a table Building that references the
> File Table:
> Field('address', 'string', label=T("Address"), requires=IS_NOT_EMPTY(),
> required=True, notnull=True, length=255),
> Field('description', 'text', label=T("Description")),
> Field('picture_id', File.Reference(), label=T("Picture"), ondelete='SET
> NULL'),
> Field('electric_company', ElectricCompany.Reference(), label=T("Electric
> Company"), ondelete='SET NULL'),
> Field('school_district', SchoolDistrict.Reference(), label=T("School
> District"), ondelete='SET NULL'),
> Field('services_ids', Service.ListReference(), label=T("Included Services"
> ), ondelete='SET NULL')
>
> File.Reference() == 'reference plugin_substratum_file' (The pydal table
> name for the File table is plugin_substratum_file)
>
> Obviously the file reference is now like any other table reference - there
> is no upload capability. I have written a widget and a validator (that are
> automatically added to the picture_id field by my ORM) that create a file
> input for the field through SQLFORM:
> class FileUploadWidget(FormWidget):
> _class = 'file'
>
> DEFAULT_WIDTH = '150px'
> ID_DELETE_SUFFIX = '__delete'
> GENERIC_DESCRIPTION = 'file ## download'
> DELETE_FILE = 'delete'
>
> @classmethod
> def widget(cls, field, value, **attributes):
> from gluon.contrib.simplejson import JSONEncoder
>
> """
> generates a INPUT file tag.
>
> Optionally provides an A link to the file, including a checkbox so
> the file can be deleted.
>
> All is wrapped in a DIV.
>
> see also: `FormWidget.widget`
>
> Args:
> field: the field
> value: the field value
> download_url: url for the file download (default = None)
> """
>
> default = dict(_type='file')
> attr = cls._attributes(field, default, **attributes)
>
> attr['_data-show-upload'] = 'false'
> attr['_data-show-close'] = 'false'
> attr['_data-overwrite-initial'] = 'true'
>
> file = File.With_ID(int(value)) if value else None
> if file:
> json = JSONEncoder()
> attr['_data-initial-preview'] = "<img src={!r} />".format(file
> .url)
> attr['_data-initial-caption'] = file.name
> attr['_data-initial-preview-config'] = json.encode([{
> 'caption' : file.name,
> 'key' : file.id
> }])
> attr['_data-layout-templates'] = json.encode({
> 'actionDelete' : ""
> })
>
> return INPUT(**attr)
>
> @classmethod
> def represent(cls, field, value):
> """
> How to represent the file:
>
> - with download url and if it is an image: <A href=...><IMG
> ...></A>
> - otherwise with download url: <A href=...>file</A>
> - otherwise: file
>
> Args:
> field: the field
> value: the field value
> download_url: url for the file download (default = None)
> """
>
> inp = current.T(cls.GENERIC_DESCRIPTION)
> file = File.With_ID(int(value)) if value else None
>
> if file:
> url = file.url
> if cls.is_image(file):
> inp = IMG(_src=url, _width
> ...
--
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- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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