Custom fields in modules development in odoo

Different type of fields used in developing module 

name = fields.Char(string="School Name", help="This is school name")
email = fields.Char(string="Email")
phone = fields.Char(string="Phone")
school_rank = fields.Integer(string="Rank", default=lambda lm:lm.get_default_rank())
is_virtual = fields.Boolean()
results = fields.Float(string="results", default=0.00, help="This is tool tip", readonly=True)
address = fields.Text(string="Address", help="This is school permanent address", default="Pakistan", trim=False)
establish_date = fields.Date(string="Establish Date")
open_date = fields.Datetime("Open Date", default=fields.Datetime.now())

2. Upload any format file.

documents = fields.Binary(string="Document")
# to display file_name
document_name = fields.Char(string="File Name")

Show in the XML file.

<group>
    <field name="documents" filename="document_name"/>
    <field name="document_name" />
</group>

3. Upload only the image 

# Image field
# we have to define some parameter in this field so it will display image
# otherwise it will took it as Binary field
# By default verify_resolution is True.when we use it with False that feild nature change
# to binary field
school_image = fields.Image(string="Upload School Image", max_width=100, max_height=100)

Show in the XML file

<group>
    <field name="school_image" widget="image" />
</group>

4. Editor-like summer-note field

# Editor text-area
school_description = fields.Html(string="About School")

Show in the XML file

<group>
    <field name="school_description" />
</group>

Different attributes use in fields

1. Caracter field with tooltip ie. help="This is school name"

name = fields.Char(string="School Name", help="This is school name")

2. Read Only field

readonly=True

name = fields.Char(string="School Name", help="This is school name", readonly=True)

3. Required field

required = True

name = fields.Char(string="School Name", required=True)

4. Assign default value to field

default="some default value"

name = fields.Char(string="School Name", default="Oriel")

set default value of date time field

default=fields.Datetime.now()

5. max character support in field

size=15

name = fields.Char(string="School Name", size=15)

6. Index fields

Indexing is used to specify the column of a table used to get data, fast. By default it is false.

index=True

name = fields.Char(string="School Name", index=True)

7. Trim field

Not remove extra spaces

trim=False

name = fields.Char(string="School Name", trim=False)

8. Change the labeling of the field from xml form view

<field name="name" string="From XML Change" />

9. Make field readonly, required, placeholder in xml view form

<field name="email" readonly="1" />

<field name="email" required="1" />

<field name="email" placeholder="abc@example.com" />

10. Hide field using invisible attribute

<field name="email" invisible="1" />

11. Set the default value of a field by calling the method

school_rank = fields.Integer(string="Rank", default=lambda lm:lm.get_default_rank())

def get_default_rank(self):
    if 1 == 1:
        return 200
    else:
        return 100

Apply the above attributes in XML page

1. Change the field labeling.

string="This is the label"

2. Readonly 

readonly="1"

3. Hide field

invisible ="1"

4. Required field

required="1"