[BUG] Error with dependency on pydantic >v2 needs addressing

[Colum McCoole]

Describe the bug
I was playing around with getting an interactive-app working, per your docs

To Reproduce
Create a test.py with this code from link above.

import meerkat as mk

@mk.reactive()
def square(a: float) -> float:
    return a**2


@mk.reactive()
def multiply(coef: float, a: float) -> float:
    return coef * a


@mk.endpoint()
def increment(value: mk.Store):
    value.set(value + 1)


input_slider = mk.gui.Slider(value=2.0)
coef_slider = mk.gui.Slider(value=2.0)

squared_value = square(input_slider.value)
result = multiply(coef_slider.value, squared_value)

button = mk.gui.Button(
    title="Increment", on_click=increment.partial(value=input_slider.value)
)

page = mk.gui.Page(
    component=mk.gui.html.div([input_slider, coef_slider, button, mk.gui.Text(result)]),
    id="quickstart",
)
page.launch()

Then run python test.py.

You get an error:

ImportError: cannot import name 'ModelField' from 'pydantic.fields' (/home/xxxx/miniconda3/lib/python3.9/site-packages/pydantic/fields.py)

It seems from this issue, ModelField no longer exists since V2 of pydantic. The above works, if I force an install of an earlier version of pydantic. (pip install pydantic==1.10.11).

Given that the default version of pydantic is >2, this will need fixing

System Information

• OS: ubuntu linux

[Matt Thompson]

Migration guide from Pydantic V1 to V2