I usually curios to know about Data Types for ActiveRecord, but the Active Record Migration documentation itself does not have that information.
So, I do some Google search and here is the TL;DR.
The ActiveRecord data types available in Rails 6;
:primary_key-
:string: short text -
:text: long text -
:integer: whole numbers [-4, 0, 9, 772] -
:float: double-precision floating-point numbers [3244.90] -
:decimal: high-precision floating-point numbers [3244.2342343789212] :datetime:time:date-
:binary: 1 / 0 -
:boolean: true or false
These data types are used in instances such as migrations.
def change
create_table :categories do |t|
t.string :title
t.boolean :is_subcategory
t.string :permalink
t.timestamps
end
end
Specific DBMS Data Type
NATIVE_DATABASE_TYPES = {
primary_key: "bigint auto_increment PRIMARY KEY",
string: { name: "varchar", limit: 255 },
text: { name: "text" },
integer: { name: "int", limit: 4 },
float: { name: "float", limit: 24 },
decimal: { name: "decimal" },
datetime: { name: "datetime" },
timestamp: { name: "timestamp" },
time: { name: "time" },
date: { name: "date" },
binary: { name: "blob" },
blob: { name: "blob" },
boolean: { name: "tinyint", limit: 1 },
json: { name: "json" },
}
NATIVE_DATABASE_TYPES = {
primary_key: "bigserial primary key",
string: { name: "character varying" },
text: { name: "text" },
integer: { name: "integer", limit: 4 },
float: { name: "float" },
decimal: { name: "decimal" },
datetime: {}, # set dynamically based on datetime_type
timestamp: { name: "timestamp" },
timestamptz: { name: "timestamptz" },
time: { name: "time" },
date: { name: "date" },
daterange: { name: "daterange" },
numrange: { name: "numrange" },
tsrange: { name: "tsrange" },
tstzrange: { name: "tstzrange" },
int4range: { name: "int4range" },
int8range: { name: "int8range" },
binary: { name: "bytea" },
boolean: { name: "boolean" },
xml: { name: "xml" },
tsvector: { name: "tsvector" },
hstore: { name: "hstore" },
inet: { name: "inet" },
cidr: { name: "cidr" },
macaddr: { name: "macaddr" },
uuid: { name: "uuid" },
json: { name: "json" },
jsonb: { name: "jsonb" },
ltree: { name: "ltree" },
citext: { name: "citext" },
point: { name: "point" },
line: { name: "line" },
lseg: { name: "lseg" },
box: { name: "box" },
path: { name: "path" },
polygon: { name: "polygon" },
circle: { name: "circle" },
bit: { name: "bit" },
bit_varying: { name: "bit varying" },
money: { name: "money" },
interval: { name: "interval" },
oid: { name: "oid" },
}
Rails data types mapping to different DB data types:
It is important to know not only the types but the mapping of these types to the database types, too:
The easy way ✌️
You can access this list everytime you want (even if you don't have Internet access) through:
rails generate model -h
The end
resources;
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